Machine dishwash filter cleaner

Abstract

A machine dishwash filter cleaner solid body which comprises: at least 60 wt.% of a water-activated effervescing system; and from 0.1 to 10 wt.% of surfactant, wherein the surfactant comprises an ionic surfactant and a nonionic surfactant, wherein the weight ratio of ionic surfactant: nonionic surfactant is from 0.5:1 to 18:1; and from 0.0005 to 10 wt. % of biofilm-control agent; and wherein a 1 wt. % solution of the composition in water provides a pH of from 2.0 to 8.0 when measured at 25 degrees Celsius and in otherwise standard conditions; and wherein the solid body has a weight of from 5 to 100 grams.

Description

Machine Dishwash Filter CleanerField of the InventionThe field of the invention relates to a solid body for cleaning / care of a machine dishwash filter; a method of in-situ treatment of a dishwasher filter and to the use of foam for in-situ treatment of a machine dishwash filter.Background of the InventionDomestic machine dishwashers are present in many homes and used daily to clean kitchenware, including dishes, cups, cutlery and so on. Modern dishwashers can operate using different types of wash-programs (Eco, Intensive, short, programs for delicate materials). Whatever the program used, cleaning is drastically improved by use of machine dishwash detergents, which in general are alkaline and detergents with little or no foaming.Machine dishwashers generally work by filling a bottom-basin with water, heating it to an appropriate temperature and mixing it with any added detergent to form a wash-liquor. The wash-liquor formed is circulated and sprayed onto the dishes using rotating spray-arms. After the main wash phase, the dirty water is drained. The main wash phase is followed by a rinse phase. The rinse phase is a repeat of the main wash phase but now using clean water to which rinse aid may be added. After the rinse-phase, the water is again drained, and the dishes are dried (drying-step, -phase). The drying phase may involve active circulation of hot air.The drain of a machine dishwasher is equipped with a drain-filter. The filter plays an important role in preventing particles (food-soils or otherwise) washed from the dishware, to be redeposited onto the dishware during operation. It may also prevent clogging the liquids circulation system and the spray-arm dispensers. Many modern dishwash machines have a manual-clean filter. Such filters need to be taken out on a regular basis and cleaned. Regular cleaning of the filter is important to maintain adequate water-flow through the filter-mesh. If this is not done regularly, the filter may suffer from a reduced water-flow. One prevalent problem occurring on filter-meshes is the formation of biofilm. Besides reducing water-flow, biofilm on the filter can also cause odor problems. Manual cleaning of filters is disagreeable to most people. It means filters need to be removed from the dishwasher, which are often in a hard-to- reach place, while the filter themselves are typically slimy and malodorous. Removal of the biofilm then typically involves manual often scrubbing the filter by hand. Some filters may also be hard to remove from the machine to begin with.It is desired to have a machine dishwash filter cleaner composition which can clean the filter in- situ, meaning that the filter does not have to be removed from the machine dishwasher to be cleaned, but that it can be cleaned while remaining in the machine dishwasher.US2003 / 0032568A1 discloses compositions for cleaning the interior of automatic dishwashers. More specifically the invention relates to acidic cleaning compositions containing enzymes to remove limescale, food and detergent residues. It provides machine cleaner in tablet form having improved cleaning performance and mentions specifically cleaning of dishwash machine filters.We have found that an in-situ dishwash filter cleaner composition advantageously fulfills several criteria to effectively clean the filter-mesh. Firstly, it must be able to contact as much of the filtermesh surface area as possible to enable adequate cleaning of the entire mesh-surface with reduced manual intervention. Secondly it may not subsequently interfere with the normal operation of the dishwasher. In particular, high amounts of persistent foam can disrupt the flow of wash-liquor from the basin through the spray-arms in any subsequent wash-cycle. Thirdly, such a dishwash filter cleaner must be easy to dose since filters are often in a difficult to access place in the interior bottom-panel of the dishwasher. This also makes it difficult to assess visually how much product is added. Fourthly, the dishwash filter cleaning ideally reduces / controls (re-)occurrence of biofilm. Finally, the process of in-situ machine dishwash filter cleaning should facilitate visual indication that the composition is active (again, the hard-to- reach place also typically prevents easy visual inspection of the filter cavity itself).As such the object of the present invention is to provide a machine dishwash filter cleaner / care composition which can be easily dosed, works- in-situ to ensure contact of a large part of the filter-mesh, has a biofilm-control activity and provides in-situ visual indication that the composition is actively engaging with the filter(-mesh).Summary of the InventionOne or more of the above objectives is achieved by a machine dishwash filter cleaner solid body which comprises:• at least 60 wt.% of a water-activated effervescing system; and• from 0.1 to 10 wt.% of surfactant, wherein the surfactant comprises a ionic surfactant and a nonionic surfactant, wherein the weight ratio of ionic surfactant: nonionic surfactant is from 0.5:1 to 18:1 ; and• from 0.0005 to 10 wt. % of biofilm-control agent; and wherein a 1 wt. % solution of the composition in water provides a pH of from 2.0 to 8.0 when measured at 25 degrees Celsius and in otherwise standard conditions; and wherein the solid body has a weight of from 5 to 100 grams.It was surprisingly found that the solid body of the invention allows easy dosing into the in-situ filter cavity of the dishwasher, by simply dropping in into the filter opening. The solid body is activated by water, which can be water remaining in the sump of the dishwasher or, if not enough, by adding additional water (or a suitable aqueous solution) in the filter opening on top to activate. The solid body forms foam by the combined action of the water-activated effervescing system and the surfactant system. The foam was found to be able to intimately contact the filter-mesh, including to penetrate the mesh spaces and thereby effectively deposit the surfactant and the biofilm-control agent onto even hard-to-reach mesh-spaces. Furthermore, the foam can be visually observed meaning that the user has feedback that the cleaning product is activated. The benefit of using a combination of the foaming ionic surfactant and nonionic surfactant is that the combination of these surfactants was found to be able to modulate the appearance of the foam and to stabilize the foam for an extended period of time. In particular it was observed that use of non-ionic surfactant provided a foam with smaller average bubble-size compared to using ionic surfactant alone. This not only provides an important visual cue that the machine dishwash cleaner is activated but also is considered to improve contact of the foam with the inter-mesh spaces of the filter. Furthermore, the foam with smaller average bubble size also provides a creamy appearance to the foam which is more visually appealing. The foaming system in general provides a quick foam volume formation which also endures for an extended period of time. This too is important as it increases the contact time of the biofilm control agent with the filter mesh.It was further surprisingly observed that having the machine dishwash filter cleaner in the form of a solid body (i.e. which has a continuous volume and is shapable, unlike a free-flowing powder) improves the foam characteristics achieved, when compared to use of a powder of the same formulation. This includes the maximum foam height achieved, but also that the foam volume remains higher for a longer period of time. The latter is important as increasing the contact time of the foam with the mesh filter logically ensures improved filter cleaning by the biofilm control agent.Hence without wishing to be bound by theory it is believe the effervescent system, the surfactant mixture and the composition being in the form of a solid body together are important to achieve the desired foaming characteristics to deliver and provide suitable contact time with the filter mesh.It was further surprisingly found that in case the solid body is made from compacted powder, that certain compression pressures used lead to more optimal foaming. Indeed, a solid body made from compacting powder at a pressure of 7 kN / cm2was found to have improved foaming characteristic versus solids made at a lower pressure of 0.2 kN / cm2and of a higher pressure of 10 kN / cm2.It was further surprisingly found that in case the solid body has a certain final hardness it provides more optimal foaming characteristics. The solid body has a preferred hardness of from 10 to 250N, more preferably of from 25 to 180N, even more preferably of from 35 to 160N, still even more preferably of from 40 to 150N and still even more preferably of from 45 to 120N, as measured based on a cuboid shape with dimensions 31 mm x 22 mm x 9 mm, as based on the method as set out in the examples.Finally, it was further surprisingly found that despite the solid body generating substantial amounts of foam that this did not impact a subsequent machine dishwash operation cycle. This is thought due to the differences caused by dosing the solid body in the normal main-wash detergent cup-holder versus when dosed directly in the machine dishwash filter-cavity.In a further aspect the invention relates to a method for the in-situ cleaning of a machine dishwash filter which comprises the following steps: a) contacting the filter with a foam, generated by bringing the solid body of the invention into contact with water I aqueous solution; and b) Incubating the foam before any subsequent machine dishwash program is started.Note that the act of contacting and incubating the foam with the filter mesh inevitably already provides some cleaning action of the filter, by virtue of the presence of surfactant. This can be further enhanced in case the solid provides an acidic pH profile at a 1 wt.% solution in water. The foam however critically enables such intrinsic cleaning to affect a large surface area of the filter mesh and to prolong contact time with high concentrations of the ingredients comprised by the solid.In a further aspect the invention relates to the use of foam comprising biofilm control-agent for the in-situ cleaning of a machine dishwash filter. Preferably it relates to the use of a foamgenerating solid-body with biofilm control-agent for the in-situ cleaning of a machine dishwash filter.Detailed Description of the InventionDefinitionsWeight percentage (wt.%) is based on the total weight of the machine dishwash filter-cleaner solid body unless otherwise indicated or as made clear from the context. It will be appreciated that the total weight amount of ingredients will not exceed 100 wt. %. Whenever an amount or concentration of a component is quantified herein, unless indicated otherwise, the quantified amount or quantified concentration relates to said component per se, even though it may be common practice to add such a component in the form of a solution or of a blend with one or more other ingredients. It is furthermore to be understood that the verb "to comprise" and its conjugations is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. Finally, reference to an element by the indefinite article "a" or "an" does not exclude the possibility that more than one of the elements is present, unless the context clearly requires that there be one and only one of the elements. The indefinite article "a" or "an" thus usually means "at least one". Unless otherwise specified all measurements are taken at standard conditions. Whenever a parameter, such as a concentration or a ratio, is said to be less than a certain upper limit it should be understood that in the absence of a specified lower limit the lower limit for said parameter is 0.Water-activatedThe effervescing system of the solid body of the invention produces gas when the composition is brought into contact with water. The gas may be of any suitable type, although preferred are carbon dioxide and / or nitrogen gas, of which carbon dioxide is the more preferred. The effervescent system may be any suitable type, but in its preferred form is based on the chemical reaction of carbonate into carbon dioxide. This reaction can be triggered by the interaction of the carbonate with water and an acid. As such advantageously the effervescent system comprises of a combination of a carbonate source and an acid.The preferred source of effervescing base is alkali metal carbonate, which is also appreciated as it functions as builder and buffer. The preferred amount of alkali carbonate in the solid body is from 15 to 75 wt.%, more preferably from 20 to 60 wt.% and even more preferably from 25 to55 wt.%. Such level of alkali carbonate provides a suitable amount of CC>2-releasing carbonate functionality as well as good Ca2+and Mg2+ion scavenging for most types of water hardness levels, as well as other builder effects, such as providing good buffering capacity. In this sense the use of sodium carbonate may facilitate the foam-modulation activity of the surfactants. The preferred alkali carbonates are sodium- and / or potassium carbonate of which sodium carbonate is particularly preferred. The alkali carbonate present in the composition of the invention is preferably present as such or as part of a more complex ingredient, for example as sodium carbonate present in sodium percarbonate. Advantageously the alkali carbonate is present as such. Advantageous examples of alkali carbonate are Na carbonate and / or Na bicarbonate.The acid of the effervescing system may be any suitable type and may be an organic acid, an inorganic acid or a combination thereof. To produce suitable amounts of gas in a short period of time after coming into contact with water, the acid preferably has (at least one) suitably low pKa. In case of acids characterized by multiple dissociation constants, by virtue of having multiple acid groups, the pKa can refer to any suitable one of these. For example, citric acid has three carboxylic acid groups and is characterized by pKa1 of 3.13, pKa2 of 4.76 and a pKa3 of 6.4. The pKa value is defined as log ([HA] I ([A'][H+]) and is typically determined in water at 25 degrees Celsius in otherwise standard conditions. Typical pKa values of some common acids can be found in the table below:The acid preferably has at least one pKa of from 4.0 to -6.0, more preferably of from 4.0 to -3.0 even more preferably of from 3.2 to -2.0, still even more preferably of from 1.5 to -1.0 and still even more preferably of from 1.2 to 0.The water-activated effervescing system, based on a base and an acid, comprises a molar excess of acid versus base in order to generate foam in a sufficient amount and in a sufficiently short amount of time. The molar ratio of acid / base is therefore above 1.1 , preferably is at least 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, where higher molar ratios are the more preferred. Preferably the molar ratio of acid / base is at most 10.0, more preferably is at most 8.0, even more preferably is at most 6.0, still even more preferably is at most 5.0, and still even more preferably is at most 4.0. Based on the above it is clear that a ratio of from 2.0 to 5.0 is more preferred than a ratio of from 1.8 to 10.0. If in doubt the molecular weight of the acid is based on the fully protonated form, and the molecular weight of the base is based on the sodium salt form. For example, the molecular weight of sodium carbonate is 106 g / mol and the molecular weight of sulfamic acid is 97 g / mol.The solid body of the invention preferably comprises of from 25 to 85 wt.% of an acid with at least one pKa of at most 4, more preferably of from 35 to 80 wt.%, even more preferably of from 45 to 75 wt. % and even more preferably of from 50 to 70 wt. %.Preferred acids for use in the invention include acetic acid, oxalic acid, tartaric acid, maleic acid, fumaric acid, ascorbic acid, benzoic acid, lactic acid, lactic acid, citric acid, sulfamic acid, phosphorous acid, sulfuric acid, hydrochloric acid and combinations thereof. Of these lactic acid, citric acid and sulfamic acid are the more preferred and especially advantageous is sulfamic acid. Of course, given that the invention relates to a solid body, it is preferred that the acid, or the used combination thereof is a solid at room temperature for ease of manufacture. In this regard preferred are solid acids are more preferred are oxalic acid, tartaric acid, citric acid, maleic acid, fumaric acid, ascorbic acid, benzoic acid, lactic acid, and sulfamic acid are solids at room temperatures and at otherwise standard conditions.Based on the above a highly preferred water-activated effervescent system comprises alkali carbonate and sulfamic acid, which balances performance, safety and reactivity of chemicals. The solid body of the invention preferably comprises as total amount of water-activated effervescing system of from 65 to 99 wt.%, more preferably of from 70 to 98 wt.% and even more preferably of from 75 to 97 wt.%The composition of the invention advantageously provides a pH of a solution of 1 wt.% of the solid body composition in water as measured at 25 degrees Celsius and in otherwise standard conditions of from 2.5 to 7.5, more preferably of from 3.0 to 6.5 and even more preferably of from 3.5 to 6.0 and still even more preferably of from 4.0 to 5.5.SurfactantIn general, surfactants are described in "Surface Active Agents" Vol. 1 , by Schwartz & Perry, Interscience 1949, Vol. 2 by Schwartz, Perry & Berch, Interscience 1958, in the current edition of "McCutcheon's Emulsifiers and Detergents" published by Manufacturing Confectioners Company or in "Tenside Taschenbuch", H. Stache, 2nd Edn., Carl Hauser Verlag, 1981. Preferably the surfactants used are saturated or monounsaturated.The machine dishwash filter cleaner composition of the invention comprises a mixture of one or more ionic surfactants and one or more non-ionic surfactant. Preferably, for ease of manufacturing the mixture comprises one ionic surfactant and / or one non-ionic surfactant.In general, ionic surfactants, preferably anionic, zwitterionic or amphoteric surfactant, as used in laundry detergents and hand-dishwash applications are suitable. These tend to be foaming and even high foaming in agitated water-systems. These may be used as ionic surfactant in the present invention. It was found that well-performing ionic surfactants are predominately composed of C10-C14 saturated alkyl chains, more preferably these contain at least 70mol% C12 saturated alkyl chains. Such chains may be obtained from the C12-14 fraction of palm kernel oil, or from petrochemical sources.Anionic surfactantThe ionic surfactant preferably comprises, more preferably essentially is anionic surfactant. Anionic surfactants are discussed in The Anionic Surfactants: Organic Chemistry edited by Helmut W. Stache (Marcel Dekker 1995), Surfactant Science Series published by CRC press. Suitable anionic surfactants are alkyl sulfate, alkyl ether carboxylates, alkyl sulfonate, alkyl sulfosuccinates and / or alkyl sulfoacetate, or mixtures thereof. Preferred are alkyl sulfate and / or alkyl ethoxy sulfates; alkyl ethoxylation sulfate with an average ethoxylation of 0 to 4, more preferably of from 1 to 3 or combinations thereof. Suitable sulphate surfactants may include water-soluble salts or acids of C10-C14 alkyl or hydroxyalkyl, sulphate and / or ether sulfate. Suitable counterions include hydrogen, alkali metal cation or ammonium or substitutedammonium. Where the hydrocarbyl chain is branched, it comprises C1-4 alkyl branching units, preferably methyl branched. The average percentage branching of the sulphate surfactant is from about 10% to about 100%, in another embodiment 30% to about 90%, in another embodiment from about 35% to about 80%, and in another embodiment from about 40% to about 60% of the total hydrocarbyl chains. Other suitable anionic surfactants are alkyl, dialkyl, sulfosuccinates and / or sulfoacetate. The dialkyl sulfosuccinates may be a C6-15 linear or branched dialkyl sulfosuccinate. The alkyl moieties may be asymmetrical (i.e. , different alkyl moieties) or symmetrical (i.e., the same alkyl moieties). The composition of the present invention may comprise a sulphonate surfactant. Those include water-soluble salts or acids of C10-C14 alkyl or hydroxyalkyl, sulphonates; C11-C15 alkyl benzene sulphonates (LAS), modified alkylbenzene sulphonate (MLAS); methyl ester sulphonate (MES); and alpha-olefin sulphonate (AOS). Rhamnolipids are another class of suitable anionic surfactants.The ionic surfactant of the solid machine dishwash filter cleaner composition of the invention preferably comprises ionic surfactant, more preferably anionic surfactant, even more preferably anionic sulphonate or sulfate surfactant, still even more preferably alkyl benzene sulphonate, modified alkylbenzene sulphonate, methyl ester sulphonate, alkyl ether sulphate, alpha-olefin sulphonate or a combination thereof; even more preferably comprises alkyl sulphate, alkyl ether sulphate or a combination thereof; and still even more preferably comprises an alkyl ether sulphate where the alkyl groups are selected from linear or branched C11 , C12, C13, C14, C15, most preferably linear C12-14. These surfactants tend to be high-foaming surfactants.Sodium laureth sulfate (SLES) is an alkyl ether sulphate and is used in the examples. This particular anionic surfactant is still even more preferred.Amphoteric and zwitterionic surfactantsSuitable amphoteric and zwitterionic surfactants are amine oxides and betaines. In one embodiment the surfactant is an amine oxide, especially coco dimethyl amine oxide or coco amido propyl dimethyl amine oxide. Amine oxides may have a linear or mid-branched alkyl moiety. Typical linear amine oxides include water-soluble amine oxides containing one R1 Cs-14 alkyl moiety and 2 R2 and R3 moieties selected from the group comprising C1.3 alkyl groups and C1.3 hydroxyalkyl groups. Amine oxides are characterized by the formula R1- N(R2)(R3) O wherein R1 is a Cs-14 alkyl and R2 and R3 are selected from the group consisting of methyl, ethyl, propyl, isopropyl, 2-hydroxethyl, 2-hydroxypropyl, 3-hydroxypropyl, and mixtures thereof. The linear amine oxide surfactants in particular may include linear C10-C18 alkyl dimethyl amineoxides and linear C8-C12 alkoxy ethyl dihydroxy ethyl amine oxides. Amine oxides include linear Cw, linear C10-C12, and linear C12-C14 alkyl dimethyl amine oxides. As used herein "midbranched" means that the amine oxide has one alkyl moiety having n1 carbon atoms with one alkyl branch on the alkyl moiety having n2 carbon atoms. The alkyl branch is located on the a carbon from the nitrogen on the alkyl moiety. This type of branching for the amine oxide is also known in the art as an internal amine oxide. The total sum of n1 and n2 is from 10 to 24 carbon atoms, from 12 to 20, and from 10 to 16. The number of carbon atoms for the one alkyl moiety (n1) should be approximately the same number of carbon atoms as the one alkyl branch (n2) such that the one alkyl moiety and the one alkyl branch are symmetric.Other suitable surfactants include betaines such alkyl betaines, alkylamidobetaine, amidazoliniumbetaine, sulfobetaine (INCI Sultaines) as well as a phosphobetaine having the formula: R1-[CO-X(CH2)n]x-N+(R2)(R3)-(CH2)m-[CH(OH)-CH2] y-Y- (I) wherein R1 is a saturated or unsaturated Ce-is alkyl residue, in one embodiment Cs-14 alkyl residue, in particular a saturated C10-15 alkyl residue, for example a saturated C12-14 alkyl residue; X is NH, NR4 with C1.4 Alkyl residue R4, O or S; n a number from 1 to 10, in one embodiment 2 to 5, in particular 3; X is 0 or 1 , in one embodiment X is 1 ; R2, R3 are independently a C1-4 alkyl residue, potentially hydroxy substituted such as a hydroxyethyl, in one embodiment a methyl; m a number from 1 to 4, in particular 1 , 2 or 3; Y is 0 or 1 ; and Y is COO, SO3, OPO(OR5)O or P(O)(OR5)O, whereby R5 is a hydrogen atom H or a C1.4 alkyl residue.Examples of suitable betaines and sulfobetaine are the following [designated in accordance with INCI]: Almondamidopropyl of betaines, Apricotam idopropyl betaines, Avocadamidopropyl of betaines, Babassuamidopropyl of betaines, Behenam idopropyl betaines, Behenyl of betaines, betaines, Canolam idopropyl betaines, Capryl / Capram idopropyl betaines, Carnitine, Cetyl of betaines, Cocamidoethyl of betaines, Cocam idopropyl betaines, Cocam idopropyl Hydroxysultaine, Coco betaines, Coco Hydroxysultaine, Coco idopropyl betaines, Coco Sultaine, Decyl of betaines, Dimethicone Propyl of PG-betaines, Erucam idopropyl Hydroxysultaine, , Lauram idopropyl betaines, Lauryl of betaines, Lauryl Hydroxysultaine, Lauryl Sultaine, Milkam idopropyl betaines, Minkamidopropyl of betaines, Myristam idopropyl betaines, Myristyl of betaines, Palmam idopropyl betaines, Palm itam idopropyl betaines, Palmitoyl Carnitine, Palm Kernelam idopropyl betaines, Polytetrafluoroethylene Acetoxypropyl of betaines, Ricinoleam idopropyl betaines.Other suitable ionic surfactants can be chosen from amphoteric and zwitterionic surfactants as described in EP2746376B1 paragraph

[0034] -

[0037] , which are hereby incorporated by reference. Especially contemplated are amino oxides as described in W095 / 05440 on page 6, lines 8 - page 9, line 2). Such amine oxides are incorporated herein by reference.Non-ionic SurfactantsNon-ionic surfactants are discussed in Non-ionic Surfactants: Organic Chemistry edited by Nico M. van Os (Marcel Dekker 1998), Surfactant Science Series published by CRC press. Preferred non-ionic surfactants are alkoxylate, preferably ethoxylated. Preferred non-ionic surfactant are alcohol ethoxylates and methyl ester ethoxylates, with C12-C18 alkyl chains.Ethoxy units may be partially replaced by propoxy units in the non-ionic surfactants.Further examples of suitable nonionic surfactants include, alkoxylated fatty acid alkyl esters, alkylpolyglycosides, alkoxylated amines, ethoxylated glycerol esters, fatty acid monoethanolamides, fatty acid diethanolamides, ethoxylated fatty acid monoethanolamides, propoxylated fatty acid monoethanolamides, polyhydroxyalkyl fatty acid amides, or N-acyl N- alkyl derivatives of glucosamine, polysorbates (TWEENS).Alcohol ethoxylate are of the formula:Ri-O-(CH2CH2O)q-H where Ri is a linear or branched C12-C18 alkyl chain, preferably selected from lauryl, myristyl, palmyl, stearyl and oleyl. Preferably n is from 9 to 40, more preferably 10 to 35, most preferably 20 to 30. Preferred examples are C11-C14 or C12-14 alcohol ethoxylates with 10EO, 11 EO, 12EO, 13EO, 14EO or 15EO.Methyl ester ethoxylate surfactant are of the form:R2(-C=O)-O-(CH2CH2-O)m-CH3Where R2COO is a C12-C18 fatty acid moiety, preferably oleic, stearic, palmitic. Preferably m is from 9 to 40, more preferably 10 to 35, most preferably 15 to 25. it is preferred that at least 40wt% of the total MEE in the composition is oleic.Methyl Ester Ethoxylates (MEE) are described in chapter 8 of Biobased Surfactants (Second Edition) Synthesis, Properties, and Applications Pages 287-301 (AOCS press 2019) by G.A. Smith; J. Am. Oil. Chem.Soc. vol 74 (1997) page 847-859 by Cox M.E. and Weerasooriva II;Tenside Surf.Det. vol 28 (2001) page by 72-80 by Hreczuch et al; by C. Kolano. Household and Personal Care Today (2012) page 52-55; J.Am.Oil. Chem.Soc. vol 72 (1995) page 781-784 by A. Hama et al. MEE may be produced the reaction of methyl ester with ethylene oxide, using catalysts based on calcium or magnesium. The catalyst may be removed or left in the MEE.Preferred non-ionic surfactants are low foaming non-ionic surfactants which are commonly used in machine dishwash detergents and are otherwise known in the art. Such non-ionic surfactants are especially low-foaming, although non-ionic surfactants in general tend to be low-foaming. The (low) foaming characteristics of non-ionic surfactants can be tuned by modifying the degree of alkoxylation or by modifying the alkyl chain. Preferred non-ionic surfactants which may be used include preferably the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, especially ethylene oxide either alone or with propylene oxide.Nonionic surfactants from the group of alkoxylated alcohols, particularly preferably from the group of mixed alkoxylated alcohols and in particular from the group of EO-AO-EO nonionic surfactants, are likewise particularly preferentially used. Preferably used nonionic surfactants originate from the groups comprising alkoxylated nonionic surfactants, in particular ethoxylated primary alcohols and mixtures of these surfactants with structurally complex surfactants such as polyoxypropylene / polyoxyethylene / polyoxypropylene (PO / EO / PO). Such (PO / EO / PO) nonionic surfactants are furthermore distinguished by good foam control.Additional preferred nonionic surfactants are:wherein n is from 0 to 5 and m from 10 to 50, more preferably wherein n is from 0 to 3 and m is from 15 to 40, and even more preferably wherein n is 0 and m is from 18 to 25. Surfactants according to this formula were particularly useful in reducing spotting of dishware treated in amachine dish washer. Preferably at least 50 wt. % of the nonionic surfactant comprised by the detergent composition of the invention is nonionic surfactant according to this formula. Such nonionic surfactants are commercially available, for example under the tradename Dehypon WET (Supplier: BASF) and Genapol EC50 (Supplier Clariant).Foaming surfactant TestThe ‘Test for determining foaming of surfactants’ as described in the Examples may be used to test foaming capacity of a surfactant in a solid relevant to the invention.In said test an ionic surfactant preferably provides a foam volume of at least 150 ml, and in increasing order of preference at least 200 ml, 250 ml, 300 ml, 350 ml, 400 ml, 450 ml, 500 ml, 550 ml, 600 ml, and even more preferably from 650 to 1500 ml after 15 min, and advantageously after 30 min.In said test a nonionic surfactant preferably provides a foam volume of at most at most 100 ml and, in order of increasing preference, of at most 90 ml, 80 ml, 70 ml, 60ml, 50 ml 40 ml after 30 min, and advantageously after 15 min.Surfactant MixtureThe composition of the invention preferably comprises a total amount of surfactant of from 0.2 to 6.0 wt. %, more preferably from 0.5 to 5.0 wt. % and even more preferably from 1.0 to 4.0 wt. %.Preferably the total amount of ionic surfactant is from 0.5 to 9 wt.%, more preferably from 0.8 to 5 wt. %, even more preferably from 1.0 to 3 wt.% and still even more preferably from 1.2 to 2.5 wt.%.Preferably the total amount of non-ionic surfactant is from 0.5 to 6 wt.%, more preferably from 0.7 to 4 wt. %, even more preferably from 0.8 to 2.0 wt.% and still even more preferably from 0.9 to 1.2 wt.%The weight ratio of ionic surfactant: nonionic surfactant preferably is from 0.6: 1.0 to 15:1.0, more preferably is from 0.8: 1.0 to 10:1.0, even more preferably is from 1.0: 1.0 to 8:1.0, still even more preferably is from 1.2: 1.0 to 4:1.0 and still even more preferably is from 1.3: 1.0 to 3:1.0.The composition of the invention advantageously comprises at least an anionic surfactant and a non-ionic surfactant.Biofilm control agentA suitable biofilm control agent reduces the proliferation of biofilm on the machine dishwash filter surface and / or removes part of the biofilm present on the filter.Biofilms are well-described. One description is that these are a syntrophic consortium of microorganisms which can stick to surfaces and which produce, often a slimy, extracellular matrix of polymeric substances (EPSs). The EPSs are produced by the cells within the biofilm and include typically a polymeric conglomeration of extracellular polysaccharides, proteins, lipids and DNA. Microorganisms living in a biofilm usually have significantly different properties from free-floating bacteria of the same species, as the dense and protected environment of the film allows them to cooperate and interact in various ways.In general biofilm control agents work by disrupting the EPS matrix, which can be accomplished by including enzymes which breakdown one or more or the polymeric substances. This may be accomplished (in whole or in part) by use of enzymes as described in S-C Jee et.al. ‘Efficient bio films eradication by enzymatic-cocktail of pancreatic protease Type-1 and bacterial alphaamylase, published 17 December 2020, Polymers 2020, 12, 3032. Suitable enzymes which can aid to remove biofilm include proteases, lipases, DNAses, endolysins and / or amylases. In addition or alternatively they may reduce the spreading I re-occurrence of biofilm.Preferably the machine dishwash filter cleaner comprises one or more proteases, amylases, lipases, DNAses, endolysins, in a combined amount of from 0.0005 to 5 wt.%, based on active enzyme levels, more preferably of from 0.001 to 3 wt.%, even more preferably of from 0.01 to 2.0 wt.%. If more than one enzyme is present each if preferably present in an amount of from 0.0005 to 0.5 wt.%. These preferred levels of enzymes are directed to actively added enzymes, not for examples as part of the enzymes which include for example those produced by any used bio-control microorganisms.Any enzyme present in the composition may be stabilized using conventional stabilizing agents, e.g., a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formyl phenyl boronic acid, and the composition may be formulated as described in e.g. WO 92 / 19709 and WO 92 / 19708.AmylaseSuitable amylases may be an alpha-amylase or a glucoamylase and may be of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Preferred are alpha-amylases. Amylases include, for example, alpha-amylases obtained from Bacillus, e.g., a special strain of Bacillus licheniformis, described in more detail in GB 1 ,296,839 or the Bacillus sp. strains disclosed in WO 95 / 026397 or WO 00 / 060060.Advantageous amylases are also sold under the tradenames Duramyl™, Termamyl™, Fungamyl™, Stainzyme™, Stainzyme Plus™, Natalase™, Amplify Prime® and BAN™ (from Novozymes A / S), and Rapidase™, Purastar™ / Effectenz™, Powerase™, Preferenz S1000™ Preferenz S1 10™, Preferenz S100™ and Preferenz S3300 (from Genencor International Inc. / DuPont). The Amplify Prime® amylase and / or Preferenz S3300 is most advantageous of the commercial amylase enzymes as being highly activate and cost-effective.ProteaseIt is particularly preferred that the solid of the invention comprises protease. Protease enzymes hydrolyse bonds within peptides and proteins. Protease enzymes hydrolyze bonds within peptides and proteins, in the laundry context this leads to enhanced control of protein or peptide containing stains. Examples of suitable proteases families include aspartic proteases; cysteine proteases; glutamic proteases; asparagine peptide lyase; serine proteases and threonine proteases. Such protease families are described in the MEROPS peptidase database (htp: / / merops.sanger.ac.uk / ). Serine proteases are preferred. Subtilase type serine proteases are more preferred. The term "subtilases" refers to a sub-group of serine protease according to Siezen et al., Protein Engng. 4 (1991) 719-737 and Siezen et al. Protein Science 6 (1997) 501 - 523.Serine proteases are a subgroup of proteases characterized by having a serine in the active site, which forms a covalent adduct with the substrate. The subtilases may be divided into 6 sub-divisions, i.e. the Subtilisin family, the Thermitase family, the Proteinase K family, the Lantibiotic peptidase family, the Kexin family and the Pyrolysin family. Most preferably the protease is a subtilisin (EC 3.4.21.62).Examples of subtilases are those derived from Bacillus such as Bacillus lentus, B. alkalophilus, B. subtilis, B. amyloliquefaciens, Bacillus pumilus and Bacillus gibsonii described in;US7262042 and W009 / 021867, and subtilisin lentus, subtilisin Novo, subtilisin Carlsberg,Bacillus licheniformis, subtilisin BPN', subtilisin 309, subtilisin 147 and subtilisin 168 described in WO 89 / 06279 and protease PD138 described in (WO 93 / 18140). Preferably the subsilisin is derived from Bacillus, preferably Bacillus lentus, B. alkalophilus, B. subtilis, B. amyloliquefaciens, Bacillus pumilus and Bacillus gibsonii as described in US 6,312,936 Bl, US 5,679,630, US 4,760,025, US7,262,042 and WO 09 / 021867. More preferably the subtilisin is derived from Bacillus gibsonii or Bacillus Lentus.Suitable commercially available protease enzymes include those sold under the trade names names Alcalase®, Blaze®; Duralase™, Durazym™, Relase®, Relase® Ultra, Savinase®, Savinase® Ultra, Primase®, Polarzyme®, Kannase®, Liquanase®, Liquanase® Ultra, Ovozyme®, Coronase®, Coronase® Ultra, Neutrase®, Everlase® and Esperase® all could be sold as Ultra® or Evity® (Novozymes A / S). Those sold under the tradename Maxatase®, Maxacai®, Maxapem®, Purafect®, Purafect Prime®, Preferenz™, Purafect MA®, Purafect Ox®, Purafect OxP®, Puramax®, Properase®, Effectenz™, FN2®, FN3®, FN4®, Excellase®, Opticlean® and Optimase® (from Genencor International Inc. / Danisco / DuPont), Axapem™(Gist-Brocases N.V.).The solid of the invention may use cutinase, classified in EC 3.1.1.74. The cutinase used according to the invention may be of any origin. Preferably cutinases are of microbial origin, in particular of bacterial, of fungal or of yeast origin.DNAseDNAse (deoxyribonuclease): The term "DNAse" means a polypeptide with DNase activity that catalyzes the hydrolytic cleavage of phosphodiester linkages in the DNA backbone, thus degrading DNA. Suitable DNAse enzymes are described in US10479981 B1 , W02013 / 043860A1 and US2020 / 0277552A1. Suitbale DNAse enzymes are commercially available, such as TurboNuclease (ex. Accelagen), the 5'-Phosphodiesterase preparation produced by submerged fermentation of Penicillum citrinum (ex. Sunsonzymes), NuCLEANase (ex. C-LEcta).Lipases are enzymes that catalyse the hydrolysis of fats. The lipase enzyme to be used according to the invention is of fungal or bacterial origin and suitable for use in detergent formulations to enhance the control of fat or oil-containing stains typically resulting from frying fats and oils, salad dressing, human sebum and cosmetics such as lipstick. A particularly preferred lipolytic enzyme for use herein is "Lipolase 100 T"® marketed by Novo Industri A / S,DK-2880 Bagsvaerd, Denmark. The activity of this fungal-derived enzyme is about 100,000 units of lipase per gram of enzyme. Another preferred lipase is Lipex Evity from Novozymes.Other biofilm control agentsAn extensive discussion of biofilm control agents is discussed in R. Roy et. al. ‘Strategies for combating bacterial biofilm: A focus on anti-biofilm agents and their mechanism of action’, Virulense 2018, 9(1): 522-554. All the anti-biofilm compounds of Table 3 therein are incorporated herein by reference. These for example include: halogenated furanone compounds, Quercetin, tannic acid, D-tyrosine, ethyl-pyruvate, polymyxin B, Gramacidin S, lantibiotics, sophorolipids, polyhexa, ethylethylene, biguanide, chlorohexidine, pyrrocoricin, bacteriocins, mannosides, desformylflustra bromine, analogs of ring-fused 2-pyridones.The total amount of biofilm-control agent preferably is from 0.001 to 6 wt.%, more preferably from 0.005 to 4 wt.%, even more preferably from 0.01 to 3.5 wt.%, still even more preferably from 0.05 to 3.0 wt.% and still even more preferably from 0.1 to 2.5 wt.%Further IngredientsBelow follows a number of optional further ingredients of the solid of the invention of which perfume and colorant are advantageously present. Beneficially the solid of the invention does not include defoamer and / or suds-suppressor. Suds suppressors can be an alkyl phosphate ester suds suppressor, a silicone suds suppressor, or combinations thereof. Suds suppressor technology and other defoaming agents useful herein are documented in Defoaming, Theory and Industrial Applications," Ed., P.R. Garrett, Marcel Dekker, N.Y., 1973, incorporated herein by reference.Further BuilderFurther builder materials may be selected from 1) calcium sequestrant materials, 2) precipitating materials, 3) calcium ion-exchange materials and 4) mixtures thereof.Examples of calcium ion-exchange builder materials include the various types of waterinsoluble crystalline or amorphous aluminosilicates, of which zeolites are known representatives, e.g. zeolite A, zeolite B (also known as zeolite P), zeolite C, zeolite X, zeolite Y and also the zeolite P-type as described in EP-A-0,384,070. The further builder may be crystalline aluminosilicate, preferably an alkali metal aluminosilicate, more preferably a sodium aluminosilicate. This is typically present at a level of less than 15 wt. %. Aluminosilicates arematerials having the general formula: 0.8-1.5 M2O. AI2O3. 0.8-6 SiC>2, where M is a monovalent cation, preferably sodium. These materials contain some bound water and are required to have a calcium ion exchange capacity of at least 50 mg CaO / g. The preferred sodium aluminosilicates contain 1.5-3.5 SiC>2 units in the formula above. They can be prepared readily by reaction between sodium silicate and sodium aluminate, as amply described in the literature. The ratio of surfactants to alumuminosilicate (where present) is preferably greater than 5:2, more preferably greater than 3:1 .Aminopolycarboxylates are well known in the detergent industry and sometimes referred to as aminopolycarboxylic acids chelants. They are generally appreciated as being strong builders. Suitable aminopolycarboxylic acids include glutamic acid N,N-diacetic acid (GLDA), methylglycinediacetic acid (MGDA), ethylenediaminedisuccinic acid (EDDS), iminodisuccinic acid (IDS), iminodimalic acid (IDM), ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethyliminodiacetic acid (HEIDA) aspartic acid diethoxysuccinic acid (AES) aspartic acid- N,N-diacetic acid (ASDA) , hydroxyethylene-diaminetetraacetic acid (HEDTA), hydroxyethylethylene-diaminetriacetic acid (HEEDTA) , iminodifumaric (IDF), iminoditartaric acid (IDT), iminodimaleic acid (IDMAL), ethylenediaminedifumaric acid (EDDF), ethylenediaminedimalic acid (EDDM), ethylenediamineditartaric acid (EDDT), ethylenediaminedimaleic acid and (EDDMAL), dipicolinic acid.Preferred aminopolycarboxylates are GLDA, MGDA, EDDS, IDS, IDM or a mixture thereof, more preferred are GLDA, MGDA, EDDS or a mixture thereof and even more preferred are GLDA and MGDA or a mixture thereof. Of these GLDA is especially preferred as it can be made from bio-based materials (e.g. monosodium glutamate, which itself can be made as by-product from corn fermentation). Also, GLDA itself is highly biodegradable. MGDA is more preferred in view of it being somewhat less hygroscopic, which improves detergent stability during storage.The solid body according to the invention may comprise from 0.5 to 40 wt. % free acid equivalent of aminopolycarboxylate. A particularly preferred amount of free acid equivalent of aminopolycarboxylate is from 0.5 to 20 wt. %, more preferably from 1.0 to 15 wt. %, even more preferably from 2.0 to 10 wt. % and still even more preferably from 3.0 to 8 wt.%.Preferred salts are alkali-based salts and more preferred are sodium-based salts.The solid body is phosphate-free, i.e., contains at most 1.0 wt. %, preferably at most 0.8 wt.%, more preferably at most 0.5 wt. %, even more preferably at most 0.2 wt.% of phosphate and still even more preferably contains essentially no phosphate. The solid body is phosphonate-free i.e., contains at most 1.0 wt. % of phosphonate, preferably at most 0.8 wt. %, more preferably at most 0.5 wt. %, even more preferably at most 0.2 wt. % of phosphonate and still even more preferably contains essentially no phosphonate. Examples of phosphonates and phosphates are 1-hydroxyethane-1 ,1-diphosphonic acid (HEDP), diethylenetriamine-penta (methylenephosphonic acid) (DTPMP), ethylenediaminetetra-methylenephosphonate (EDTMP), tripolyphosphate and pyrophosphate.Bleach SystemThe solid body may comprise a bleach system. A bleach system comprises one or more of bleach, bleach activator and bleach catalyst. The presence of bleach may help in reducing the biofilm microbial population.BleachThe solid body of the invention preferably comprises from 0.1 to 25 wt. % of bleach. Inorganic and / or organic bleaches can be used. Bleach may be selected from peroxides, organic peracids, salts of organic peracids and combinations thereof. Advantageously the bleach is selected from peroxides (including peroxide salts such as sodium percarbonate), organic peracids, salts of organic peracids and combinations thereof. More preferably, the bleach is a peroxide. Most preferably, the bleach is a percarbonate. Further preferred, the bleach is a coated percarbonate. More preferred amounts of bleach are from 1.0 to 25 wt.%, even more preferably at from 2.0 to 20 wt. % and still even more preferably from 5 to 15 wt.%.Bleach activatorThe solid body of the invention preferably comprises one or more bleach activators such as peroxyacid bleach precursors. Peroxyacid bleach precursors are well known in the art. As nonlimiting examples can be named N, N, N', N '-tetraacetyl ethylene diamine (TAED), sodium nonanoyloxybenzene sulphonate (SNOBS), sodium benzoyloxybenzene sul phonate (SBOBS) and the cationic peroxyacid precursor (SPCC) as described in US-A-4, 751 ,015. A beneficial amount of bleach activator is from 0.1 to 10 wt.%, more preferably from 0.5 to 5 wt.% and even more preferably from 1.0 to 4 wt. %.Bleach catalystBleach catalysts function by oxidizing typically via peroxide or a peracid to form a bleaching species. They require the presence of an oxidizable soil so that they can be reduced back to the starting bleach activator state. A preferred bleach catalyst is a manganese complex of formula (A):[LnMnmXp]zYq wherein Mn is manganese, which can be in the II, III, IV or V oxidation state or mixtures thereof; n and m are independent integers from 1-4; X represents a co-ordination or bridging species; p is an integer from 0-12; Y is a counter-ion, the type of which is dependent on the charge z of the complex which can be positive, zero or negative; q = z / [charge Y]; and L is a ligand being a macrocyclic organic molecule of the general formula:wherein R1and R2can each be zero, H, alkyl or aryl optionally substituted; t and t’ are each independent integers from 2-3; each D can independently be N, NR, PR, O or S, where R is H, alkyl or aryl, optionally substituted; and s is an integer from 2-5. Such bleach catalysts are described in EP0458397A2.The beneficial amount of bleach catalyst is from 0.0001 to 2.0 wt. %, more preferably from 0.001 to 1.5 wt.%, even more preferably from 0.01 to 1.0 wt. %.Perfume and colorantsThe solid body of the invention preferably comprises one or more colorants, one or more perfumes and more advantageously a mixture of at least one colorant and at least one perfume. Colorants are beneficially present in an amount of from 0.0001 to 8 wt. %, more preferably from 0.001 to 4 wt. % and even more preferably from 0.001 to 1.5 wt. %.Perfume may be present in the range from 0.1 to 1 wt. %. Many suitable examples of perfumes are provided in the CTFA (Cosmetic, Toiletry and Fragrance Association) 1992 International Buyers Guide, published by CFTA Publications and OPD 1993 Chemicals Buyers Directory 80th Annual Edition, published by Schnell Publishing Co. In perfume mixtures preferably 15 to 25 wt. % are top notes. Top notes are defined by Poucher (Journal of the Society of CosmeticChemists 6(2):80

[1955] ). Preferred top-notes are selected from citrus oils, linalool, linalyl acetate, lavender, dihydromyrcenol, rose oxide and cis-3-hexanol.In general consumers nowadays wish to have short ingredient listings which have clear recognized function for the purpose to which there are applied. As such, apart from the watereffervescing system, surfactant mixture, biofilm-control agent, perfume, colorants and filler the solid body of the invention comprises preferably at most 5, 4, 3, 2, 1 and 0 additional ingredients, where fewer additional ingredients are the more preferred.Form of the compositionThe solid machine dishwash filter cleaner composition is in the form of a solid body. Advantageously solid is as such a unit-dose which may be shaped in any suitable form. Of course, preferred are shapes are those which can easily be inserted into the machine dishwash filter cavity. Preferred shapes are cuboid, cylindrical and spherical for ease of manufacturing.Also, in view of providing a solid body which is better able to deposit foam onto the entire meshsurface the volume of the solid is preferably from 4 to 20 cm3, more preferably 6 to 15 cm3and even more preferably from 7 to 12 cm3.The solid of the invention has a preferred weight of from 10 to 60 grams, more preferably from 15 to 40 grams and even more preferably from 16 to 25 grams.The solid of the invention is preferably of suitable density to promote rapid interaction with water and foam generation. The preferred density is from 0.5 to 5.0 grams / cm3, more preferably from 0.8 to 4.0 grams / cm3, even more preferably from 1.0 to 3.0 grams / cm3and still even more preferably from 1.5 to 2.5 grams / cm3. Such densities for a solid body of the invention are considered to provide optimal foaming behavior.For solid bodies of the invention made from compressed powder / granular material, the preferred compaction pressured used is from 0.1 to 20 kN / cm2, more preferably from 0.2 to 18 kN / cm2, even more preferably from 2 to 16 kN / cm2, still even more preferably from 4 to 14 kN / cm2and still even more preferably is from 5 to 12 kN / cm2. This was found to provide optimal density of the solid to provide improved foaming characteristic for granular / powder ingredients used to make the solid body via compression.The solid body of the invention is preferably not encapsulated by a water-soluble film. The solid body may be water-soluble film wrapped although this may retard to onset of foam-formation, reduce foam height, duration and prevent uniformly exposing the filter mesh to the foam. This may also depend on the surface area of the solid body covered by the water-soluble film. The benefit of having parts of its surface covered by a water-soluble film is to provide gripping means to reduce direct contact with skin and to improve storage stability. As such, the solid body is preferably not fully encapsulated by a water-soluble film. Although some parts may be film-wrapped to provide some gripping means.Preferably in case the solid body surface is covered by water-soluble film the maximum area covered, based on total surface area is at most 95 %, more preferably at most 70 %, even more preferably at most 50 % and still even more preferably is at most 30 %. Still even more preferably the solid body does not comprise water-soluble film on its outer surface.A compressed 18 grams granular tablet (cuboid) with size dimensions of 1.2 cm x 2.7 cm x 3.7 cm has a total surface area of about 35 cm2. Of course, for 18 grams of powder material, the total surface area of the powder is orders of magnitude greater (e.g. can be more than 1 m2 / gram; or 10,000 cm2 / gram). The solid body of the invention, also considering irregular shapes, has a preferred surface area of from 10 to 500 cm2, more preferably of from 15 to 300 cm2, even more preferably of from 20 to 150 cm2and even more preferably of from 25 to 100 cm2.Especially advantageous are machine dishwash filter cleaner solid bodies according to the invention, which when brought into contact with 100 ml, at otherwise standard conditions generate at total volume (foam + liquid) after 15 min (and more preferably after 30 min) of incubation of at least 300 ml, preferably of at least 350 ml, more preferably of at least 400 ml, even more preferably of at least 450 ml, still even more preferably of at least 500ml, still even more preferably of at least 550ml, still even more preferably of at least 600ml to 1500 and still even more preferably of from 650 to 1000ml. A suitable foaming test is described in the Example 1.Process of manufactureThe solid of the invention can be made using conventional techniques and manufacturing equipment in the field of (machine dishwash) detergent manufacturing. During manufacture it is desired that the ingredients are homogenously mixed, before being processed into a solid body. A preferred method of production includes homogenous mixing the ingredients to form a mixedpowder, followed by compacting the powder into a solid body. As indicated, advantageous compaction force is from 0.1 to 20 kN / cm2, more preferably from 0.2 to 18 kN / cm2, even more preferably from 2 to 16 kN / cm2, still even more preferably from 4 to 14 kN / cm2and still even more preferably is from 5 to 12 kN / cm2.Method of in-situ cleaningIn a further aspect the invention relates to a method for the in-situ cleaning of a machine dishwash filter which comprises the following steps: a) contacting the filter with a foam, generated by bringing the solid body of the invention into contact with an aqueous solution, which may comprise only water; and b) Incubating the foam before any subsequent machine dishwash program is started.As needed, step a) may be preceded by a step which removes any cap from the drain to access the machine dishwash filer cavity. Step a) may also be fulfilled by pouring pre-generated foam into the filter cavity. Preferably however, the solid body of the invention is inserted into the filter cavity and the foam is generated in-situ.As such, the solid machine dishwasher filter cleaner of the invention is preferably used in the method of in-situ cleaning of a machine dishwash filter. In this case step a) may be the result of adding the solid composition to the filter-cavity. There it may be activated by residual sump water and / or if needed further aqueous liquid is added on top of the solid in the cavity.In this sense, a preferred method to ensure consistent activity of the filter cleaner composition comprises the following steps: a) Placing (e.g. dropping) the machine dishwash filter cleaner solid body into the machine dishwash filter cleaner cavity; and b) Optionally, adding water / aqueous solution on-top of the solid; and c) Incubating the foam before any subsequent machine dishwash program is started.The preferred amount of water added on-top of the solid is preferably from 50 to 500 ml, more preferably from 100 to 350 ml, even more preferably from 150 to 250 ml. These levels of water provide adequate foam formation and foam characteristicsAfter contacting the filter mesh, with foam generated from the solid body of the invention, the foam is incubated on the mesh for a suitable time to allow the surfactant to act on the biofilm and for the micro-organisms to attach to the filter mesh. Longer incubation times before anysubsequent machine dishwash program is started are preferred. The incubation time is preferably at least 2 min, more preferably at least 5 min, even more preferably at least 10 min, still even more preferably at least 30 minutes and still even more preferably at least 60 min.It was surprisingly found that the foam generated in the machine dishwash filter did not interfere with a subsequent machine dishwasher operation cycle. This is surprising as, at least in view of main-wash detergents, which are intended to be dosed in the main-wash detergent cup. For main wash detergents the accepted view is to avoid detergents which may cause foaming when in contact with water as much as possible.Aspects mentioned in the context of the machine dishwash cleaner solid body (e.g. the ingredient formulation of the solid composition) apply mutatis mutandis to aspects of the method for in-situ leaning of a machine dishwash filter using the solid and / or the use of the solid for the in-situ cleaning of a machine dishwash filter (and visa versa).ExamplesTest for determining foaming of surfactantsThe following test can be used to determine the foaming behavior of a surfactant:1) Provide the following base formulation in the form of a machine dishwash compressed tablet* of 18 grams:* The compaction pressure used was 6.9 kN / cm2to form a tablet of shaped and sized like a regular machine dishwash tablet (-dimensions of 1.2 cm x 2.7 cm x 3.7).2) Provide a laboratory volumetric measuring cylinder of 1000 ml with 100 ml demineralized water. The cylinder used is a Graduated cylinder, tall form, BLAUBRAND®, class A, Boro 3.3, DE-M, USP Boro 3.3. DIN EN ISO 4788. Calibrated to contain (TC, In). With spout and hexagonal glass base (Cat. No. 32862, Supplier: Brand).3) Add the tablet to the cylinder and read foam-height generated after 15 min and again after 30 min.The test is conducted in otherwise standard conditions. Preferred foaming surfactant provides a foam-height in the above test of at least 100 ml after 15 min. Preferred non-ionic surfactants provide a foam-height in said test below 100 ml.For example, sodium lauryl sulphate will provide a foam height of above 100ml in the above test after 15 min and 30 min. For example, LIALET 111-10, which is a C10 branched alcohol ethoxylate with an average of 10EO non-ionic surfactant (Supplier: SASOL), in the above test will provide a foam-height of below 100ml after 15 min and 30 min.Example 1 - Impact of surfactant system on foaming capacity.Machine dishwash filter cleaner formulations were made as set out in the Table 1 below.Table 1 : Formulations testedTable 1 - continued(Supplier: SASOL).The foaming characteristic of the formulations were tested according to the following procedure: 1) Provide a laboratory volume measuring cylinder of 1000 ml with 100 ml demineralized water. The cylinder used is a Graduated cylinder, tall form, BLAUBRAND®, class A, Boro 3.3, DE-M, USP Boro 3.3. DIN EN ISO 4788. Calibrated to contain (TC, In). With spout and hexagonal glass base (Cat. No. 32862, Supplier: Brand).2) Add the formulation (as 18 g tablet or 18 gram powder) to the cylinder and read the foam- height after 15 min and the foam height after 30 min. Observe foam density characteristics.The test is conducted in otherwise standard conditions.The results of the foaming properties of the Examples and Comparative formulations can be found in Table 2 below:Table 2: foaming characteristics of Examples 1 to 4 and Comparatives A to HThe results of Example 1 show that the presence of both an ionic surfactant and non-ionic surfactant is important to provide sufficient foaming after an extended period. It also shows the requirement of the machine dishwash filter cleaner to comprise the effervescing system and the surfactants in a (compressed) solid body.Example 2 - Impact of effervescing system on foaming capacity.Machine dishwash filter cleaner formulations were made as set out in the Table 3 below. Table 3: formulations tested.1LIALET 111-10, which is a C10 branched alcohol ethoxylate with an average of 10EO (Supplier: SASOL).Table 3- continuedThe foaming characteristic of the formulations were tested according to the procedure of Example 1. The results of the foaming properties of the Examples and Comparative formulations can be found in Table 2 below:Table 4: foaming characteristics of Examples 5 to 10 and Comparatives I to NThe results of Example 2 show that an excess of acid versus sodium carbonate is required to provide adequate foaming.Example 3 - Impact of tablet hardness on foamingMachine dishwash filter cleaner formulations were made as set out in the Table 5 below.Table 5: formulations tested.1Lutensol AT25 (Supplier: BASF).Three types of 18g compressed solids were made with this formulation, which differed in the compaction force applied in the tableting process. The tableting was performed in an Auto Carver CE press, model 3888CEPR0000). Molds were filled with 18g of powder with a formulation according to Example 9, 10 or 11 . The mold was lightly tapped on a hard surface to ensure even distribution of the powder before compaction. The dwell time during compaction was 1 second. The tablet of Example 9 was in the form of a cylinder, rather than cuboid (as was the case for the tablets of Ex. 10 and 11). The tablets of Ex. 10 and 11 had dimensions of 31.1 mm x 22.4 mm x 9.1 mm. The is no particular reason for this difference in shape other than that the solid of example 9 made with such a low compaction force was simply readily at hand.Solid Hardness measurementAfter production the hardness of the solids was also measured using a Kraemer Elektronik labline H5 Series Tablet Testing System purchased from Charles Ischi AG. The following procedure was used: The solid is placed on the plate below the moving jaw. The moving jaw was equipped with a “V” shaped cutting jaw tip of 90-degrees V-angle). The V” shaped cuttingjaw tip is more specifically a triangular prism-shape, where the walls which form the 90-degree V-corner provide a straight leading cutting edge of 16mm length. The height of the V-shape was 2.9 mm. The prism-shaped cutting tip is otherwise centrally placed on a rectangular flat-face with dimension of 16 x 22 mm, where the 16mm cutting-edge is parallelly aligned with the 16 mm side of the rectangular flat face. The rectangular flat-face is part of a simple 6-sided cuboid with a further dimension of 67.7 mm. The cuboid plus the triangular prism combined thus form the overall shape of the moving jaw.The moving jaw moves at a speed of 35mm / sec until to solid fractures. A calibrated load cell measures the required force to break the tablet as expressed in Newtons (N). In case of tabletshapes of approximately cuboid shape which usually have two large faces, two medium faces and two small faces, it is preferred that the break-force is measured when the solid is placed on its side so that cutting edge contacts a medium face. For practical reasons the puck-shape solid was placed on its flat face so that the cutting edge contacts the opposing flat surface. With approximate cube- or spherical shaped, which face contacts the cutting edge is usually irrelevant.Solids of the invention, as provided in a cuboid shape of dimensions 31 mm x 22 mm x 9 mm, have a preferred hardness of from 10 to 250N, more preferably of 25 to 180N, even more preferably of from 35 to 160N, still even more preferably of from 40 to 150N and still even more preferably of from 45 to 120N. The more preferred hardness was found to coincide with more preferred foaming characteristics.The solids thus formed were tested for foaming capacity, according to the procedure used in Example 1 and 2. The foaming results are indicated in Table 6 below.Table 6: foaming characteristics - impact of compaction force.The results of Table 6 show that the compaction pressure applied has an impact on the foaming behavior of the solid.

Claims

Claims1. A machine dishwash filter cleaner solid body which comprises:• at least 60 wt.% of a water-activated effervescing system; and• from 0.1 to 10 wt.% of surfactant, wherein the surfactant comprises a ionic surfactant and a nonionic surfactant, wherein the weight ratio of ionic surfactant: nonionic surfactant is from 0.5:1 to 18:1 ; and• from 0.0005 to 10 wt. % of biofilm-control agent; and wherein a 1 wt. % solution of the composition in water provides a pH of from 2.0 to 8.0 when measured at 25 degrees Celsius and in otherwise standard conditions; and wherein the solid body has a weight of from 5 to 100 grams.

2. A machine dishwash filter cleaner solid body according to claim 1 , wherein the solid body is a compressed powder solid body made using a compaction pressure of from 0.1 to 20 kN / cm2, preferably of from 0.2 to 18 kN / cm2, more preferably of from 2 to 16 kN / cm2, even more preferably of from 4 to 14 kN / cm2and still even more preferably of from 5 to 12 kN / cm2.

3. A machine dishwash filter cleaner solid body according to claim 1 or claim 2, wherein the solid body has a hardness of from 10 to 250N, preferably of from 25 to 180N, more preferably of from 35 to 160N, even more preferably of from 40 to 150N and still even more preferably of from 45 to 120N, as measured based on a cuboid shape with dimensions 31 mm x 22 mm x 9 mm, wherein the hardness is measured using a Kraemer Elektronik labline H5 Series Tablet Testing System purchased from Charles Ischi AG equipped with a moving jaw with a “V” shaped cutting jaw tip of 90-degrees V-angle.

4. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the ionic surfactant provides a foam volume of at least 150 ml, preferably at least 250 ml, more preferably at least 350 ml, even more preferably at least 450 ml and still even more preferably of from 650 to 1500ml after 15 min, using the following test method: the foaming characteristic of the formulations were tested according to the following procedure:1) providing a laboratory volume measuring cylinder of 1000 ml with 100 ml demineralized water, wherein the cylinder used is a Graduated cylinder, tall form, BLAUBRAND®, class A, Boro 3.3, DE-M, USP Boro 3.

3. DIN EN ISO 4788, (Cat. No. 32862, Supplier: Brand); and2) adding the formulation (as 18 g tablet or 18 gram powder) to the cylinder and reading the foam-height after 15 min; wherein the test is conducted in otherwise standard conditions.

5. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the ionic surfactant comprises anionic surfactant, more preferably anionic sulphonate surfactant, even more preferably alkyl benzene sulphonate, modified alkylbenzene sulphonate, methyl ester sulphonate, alkyl ether sulphate, alpha-olefin sulphonate or a combination thereof; and even more preferably comprises alkyl benzene sulphonate, alkyl ether sulphate or a combination thereof; and still even more preferably comprises sodium lauryl ether sulphate (SLES), sodium dodecyl sulfate (SDS) or combinations thereof.

6. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the non-ionic surfactant provides a foam volume of at most 100 ml, preferably at most 90 ml, more preferably at most 80 ml, even more preferably at most 70 ml and still even more preferably of from at most 60 ml after 15 min, using the following test method: the foaming characteristic of the formulations were tested according to the following procedure:1) providing a laboratory volume measuring cylinder of 1000 ml with 100 ml demineralized water, wherein the cylinder used is a Graduated cylinder, tall form, BLAUBRAND®, class A, Boro 3.3, DE-M, USP Boro 3.

3. DIN EN ISO 4788, (Cat. No. 32862, Supplier: Brand); and2) adding the formulation (as 18 g tablet or 18 gram powder) to the cylinder and reading the foam-height after 15 min; wherein the test is conducted in otherwise standard conditions..

7. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the non-ionic surfactant comprises alkoxylated alcohols with an average degree of alkoxylation of from 2 to 80, more preferably of from 6 to 50, even more preferably of from 8 to 40.

8. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the water-activated effervescing system based on a base and an acid comprises a molar ratio of acid I base is at least 1.2, preferably at least 1.6, more preferably is at least 2.0, even more preferably is from 2.4 to 10.0 and still even more preferred is from 2.6 to 5.0, wherein the molecular weight of the base is based on the sodium salt form and the molecular weight of the acid is based on the fully protonated form.

9. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the water-activated effervescing system, based on the total weight of the water-activated effervescing system, comprises of from 25 to 85 wt.% of an acid with at least one pKa of at most 4, more preferably of from 35 to 80 wt.%, even more preferably of from 45 to 75 wt. % and even more preferably of from 50 to 70 wt. %, wherein the pKa is measured at 25 degrees Celsius in water and at otherwise standard conditions.

10. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the pH of a 1 wt. % solution of the composition in water as measured at 25 degrees Celsius and in otherwise standard conditions is from 2.5 to 7.5, more preferably of from 3.0 to 6.5 and even more preferably of from 3.5 to 6.0 and still even more preferably of from 4.0 to 5.5.

11. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the total amount of surfactant is from 0.2 to 6.0 wt. %, even more preferably from 0.5 to 5.0 wt. %, still even more preferably from 1.0 to 4.0 wt. % and still even more preferably is from 1 .5 to 3.5 wt.%.

12. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the weight ratio of ionic surfactant: nonionic surfactant (ionic surfactant I nonionic surfactant) preferably is from 0.6: 1.0 to 15:1.0, more preferably is from 1.0: 1.0 to 8:1.0, even more preferably is from 1.2: 1.0 to 4:1.0 and even more preferably is from 1.3: 1.0 to 3:1.0.

13. A machine dishwash filter cleaner solid body according to any preceding claim, wherein the body upon contact with 100 ml water, at otherwise standard conditions, provides a total volume (liquid + foam) of at least 300ml, more preferably of at least 500ml, even more preferably of from 600 to 1500ml, and still even more preferably of from 650 to 1000ml after 30 min, using the following test method: the foaming characteristic of the formulations were tested according to the following procedure:1) providing a laboratory volume measuring cylinder of 1000 ml with 100 ml demineralized water, wherein the cylinder used is a Graduated cylinder, tall form, BLAUBRAND®, class A, Boro 3.3, DE-M, USP Boro 3.

3. DIN EN ISO 4788 (Cat. No. 32862, Supplier: Brand); and2) adding the formulation (as 18 g tablet or 18 gram powder) to the cylinder and reading the foam-height after 30 min; wherein the test is conducted in otherwise standard conditions.

14. A method of in-situ cleaning a machine dishwash filter comprising the steps of: a) contacting the filter with a foam, generated by bringing the solid body according to any preceding claim into contact with from 50 to 500 ml of water; and b) Incubating the foam before any subsequent machine dishwash program is started.

15. Use of a foam-generating solid comprising biofilm control-agent for the in-situ cleaning of a machine dishwash filter.

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