Method for removing abnormal odor in a building

Abstract

To provide a method for removing abnormal odors more safely without the need for large-scale mechanical equipment. 【Solution means】The method for removing abnormal odors in a building includes a first step of disinfecting the abnormal odor area in the building, a second step of removing the source of the abnormal odor in the abnormal odor area after the first step, a third step of coating the location where the source of the abnormal odor has been removed with a resin paint after the second step, a fourth step of spraying hot water at a predetermined temperature into the abnormal odor area after the third step, and a fifth step of spraying an odor-removing neutralizing and decomposing agent into the abnormal odor area after the fourth step, and is characterized by comprising these steps.

Description

Technical Field

[0001] The present invention relates to a method for removing abnormal odors in a building.

Background Art

[0002] Conventionally, as abnormal odors (bad odors) in buildings that are difficult to remove, for example, there are burnt odors from fires and soot odors from attached soot, putrid odors when human or animal corpses and excrement are left unattended for a long time, mold odors, tobacco odors, tar odors, fragrance odors, secondary petroleum odors, spice odors, abnormal odors caused by specific malodorous substances (22 substances), etc.

[0003] Regarding the former, if left unattended, it may cause health problems such as headaches, dizziness, nausea, and sore throats. Regarding the latter, putrid body fluids, blood, excrement, etc. (odor sources) from the corpses may penetrate into the structures of the building such as the floor, walls, pillars, and ceiling, making it even more difficult to remove the abnormal odor.

[0004] As a technique related to the present invention, for example, Patent Document 1 discloses a deodorization method for a room where a deceased person and / or an animal has been left unattended, including a dirt cleaning operation for cleaning dirt consisting of one or more selected from body fluids, feces, and urine, a disassembling operation for disassembling the location where the dirt adheres before the ozone fumigation operation, an ozone fumigation operation for spraying ozone into the room after the dirt cleaning operation, a covering operation for covering the location disassembled in the disassembling operation with an oil-based primer after the ozone fumigation operation, and a coating operation for applying a resin material containing a curing agent to the inner wall where the dirt remains after the covering operation.

[0005] In addition, Patent Document 2 includes a first step of disinfecting an odor area in a building, a second step of removing an odor source in the odor area by polishing and / or cleaning, a third step of coating a location where the odor source has been removed with a resin paint, and a fourth step of fumigating with hydroxyl radicals generated using a hydroxyl radical generator (except for the case where ozone is generated by an ozone gas generator, sent into the space, and hydroxyl radicals are generated by reaction with moisture in the space). The first step to the fourth step are performed in the described order, and in the fourth step, another operation is performed in parallel in the odor area. A method for removing odors in a building is characterized by this. A method for removing odors in a building is disclosed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] According to the above Patent Document 1, deodorization can be performed using an ozone generator. Also, according to the above Patent Document 2, deodorization can be performed using a hydroxyl generator. However, these methods require large-scale mechanical equipment and electricity. In addition, ozone gas has an adverse effect on the human body, and the hydroxyl generator also generates some ozone gas, so there is an adverse effect on the human body.

[0008] An object of the present invention is to provide a method for removing odors more safely without the need for large-scale mechanical equipment.

Means for Solving the Problems

[0009] The method for removing odors in a building according to the present invention is The putrid odor when the corpses and excreta of humans and animals are left unattended for a long time Inside the buildingAdhered to the surface of building materials Malodor area In a humidity environment of 60%, hot water spraying of spraying 40°C hot water Process, and The said hot water spraying after the process, in the malodor area Among them, a deodorizing component derived from plants composed of plant-derived components reacts with functional groups to decompose and deodorize the putrid odor spray a deodorizing neutralizing decomposing agent Spraying of deodorizing neutralizing decomposition agent process, and is characterized by comprising the above.

[0010] Also, in the method for removing malodor in a building according to the present invention, the predetermined temperature is preferably 35 to 45°C.

[0011] Also, in the method for removing malodor in a building according to the present invention, it is a process inserted between the second process and the third process when the malodor source remains in the structure of the building after the second process, and the sixth process of disassembling the structure to expose the malodor source remaining in the structure, and after the sixth process, it is a process inserted between the sixth process and the third process, and preferably comprises a seventh process of removing the exposed malodor source.

Effect of the Invention

[0012] According to the present invention, large-scale mechanical equipment is not required, and malodor can be removed more safely.

Brief Description of the Drawings

[0013]

Figure 1

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the following, the same elements in all the drawings are denoted by the same reference numerals, and redundant descriptions are omitted. Also, in the description in the text, the reference numerals described previously will be used as necessary.

[0015] FIG. 1 is a flowchart showing the procedure of a method for removing abnormal odors in a building according to an embodiment of the present invention.

[0016] The method for removing abnormal odors in a building according to this embodiment includes a first step of disinfecting the abnormal odor area in the building, a second step of removing the source of the abnormal odor in the abnormal odor area after the first step, a third step of coating the location where the source of the abnormal odor has been removed with a resin paint after the second step, a fourth step of spraying hot water at a predetermined temperature onto the abnormal odor area after the third step, and a fifth step of spraying a deodorizing neutralizing and decomposing agent onto the abnormal odor area after the fourth step.

[0017] After significantly reducing the abnormal odor by the first to third steps, hot water at 35 to 45 °C, preferably 40 °C, is sprayed onto the abnormal odor area (fourth step). It is preferable that the hot water at 40 °C is sprayed by a cleaning worker using a pressure-type spraying machine.

[0018] After the fourth step, a deodorizing neutralizing and decomposing agent is sprayed onto the area where the hot water has been sprayed (sixth step). It is preferable that the deodorizing neutralizing and decomposing agent is sprayed by a cleaning worker using a pressure-type spraying machine. The deodorizing neutralizing agent is a liquid that changes the components causing the bad odor into odorless components through a chemical reaction.

[0019] The deodorizing neutralizing and decomposing agent causes a chemical reaction between the malodorous substance and the deodorant component, changing it into an odorless substance. Also, the deodorizing neutralizing and decomposing agent neutralizes acidic odor molecules with alkalinity and alkaline odor molecules with acidity. By chemically decomposing in a neutral state, it decomposes the chemical composition bonds of the odor substances to deodorize. Through these reactions, the deodorizing neutralizing and decomposing agent effectively acts on the odor molecules that are the source of the odor.

[0020] The deodorizing neutralizing and decomposing agent is considered to mainly cause the following two reactions. <Chemical Reaction> The malodorous substance and the deodorant component cause a chemical reaction and change into an odorless substance. <Neutralization Effect> The malodorous substance and the deodorant component interfere with each other, making the odor imperceptible.

[0021] In addition, the deodorizing neutralizing and decomposing agent is composed of plant-derived components, and the plant-derived deodorizing components react with functional groups such as ammonia and hydrogen sulfide to decompose and deodorize. Therefore, substances that are environmentally friendly and safe for the human body are used. Also, since no surfactant is used, there is no sticky feeling.

[0022] Furthermore, since the deodorizing neutralizing and decomposing agent also passes the metal corrosion test, fiber bleaching test, oral toxicity test, residual pesticide detection test, and harmful heavy metal detection test, cleaning workers can perform the deodorizing work safely. Also, since no equipment investment such as an ozone generator or a hydroxyl generator is required, anyone can deodorize easily with a low budget.

[0023] In the fourth step, the pores on the surface of building materials (gypsum board, wood, concrete) sprayed with 40°C hot water are opened. By performing the fifth step after the fourth step, the osmotic pressure generated by spraying the plant-derived deodorizing neutralizing and decomposing agent on the opened building material surface is utilized to neutralize and decompose the nucleus (DNA), which is the source of the odor, for deodorization.

[0024] By going through the fifth step, it is possible to remove the strange odor in the building while reducing damage to the human body, animals and plants, leather products, electrical products, etc. Also, since cleaning workers no longer need to take shelter after spraying hot water and the deodorizing neutralizing and decomposing agent, they can perform another task in parallel and shorten the working time.

[0025] Note that in this specification, "disinfection" (preventing infection by killing pathogenic bacteria (Kodansha Encyclopedia)) includes the meanings of "sterilization" (killing pathogens such as bacteria (Kodansha Encyclopedia)), "bacteria removal" (removing bacteria (Kodansha Encyclopedia)), and "sterilization" (creating a sterile state by heat, chemicals, etc. (Kodansha Encyclopedia)).

[0026] In this embodiment, there are no particular restrictions on the strange odor in the building that is difficult to remove. For example, there are the burnt smell and soot odor due to the charred remains of a fire (including small fires) and the attached soot, the putrid smell when human or animal carcasses and feces are left unattended for a long time, the mold smell, the tobacco smell, the tar smell, the fragrance smell, the second-class petroleum smell, the spice smell, the strange odor due to specific malodorous substances (22 substances), etc.

[0027] In addition, in this embodiment, a method for deodorizing typical fire odors caused by charring and attached soot in a fire-damaged property, and putrid odors caused by the long-term abandonment of human and animal carcasses and excrement in an accident-damaged property will be disclosed. Also, in this embodiment, the type of building is not particularly limited, and examples include apartment houses such as condominiums and apartments, detached houses, commercial buildings, office buildings, warehouses, hospitals, gymnasiums, arena facilities, accommodation facilities, and the like.

[0028] (1) In the case of the fire odor of a fire-damaged property <The first step (S1): Disinfection> In a fire-damaged property, not only does the fire odor remain, but mold may also occur and spread in the fire-extinguishing water. Therefore, in order to ensure the safety of cleaning workers, the method for removing abnormal odors in the building of this embodiment includes a first step of disinfecting the abnormal odor area in the building. In the case of a fire-damaged property, the abnormal odor area may include the area where the fire-extinguishing water was sprayed.

[0029] The disinfectant used for disinfection is not particularly limited as long as it is generally used for disinfection. For example, an aqueous solution of a compound having oxidizing power such as stable chlorine dioxide can be mentioned. The method of spraying the disinfectant is not particularly limited, and it may be spray-sprayed over the entire abnormal odor area in the building, or it may be sprayed intensively on the abnormal odor source.

[0030] In the case of the fire odor of a fire-damaged property, the method for removing abnormal odors in the building of this embodiment may further include a step of disassembling or removing the furniture in the abnormal odor area before the first step. Thereby, the subsequent steps can be carried out smoothly.

[0031] <The second step (S2): Removal> The method for removing abnormal odors in the building of this embodiment includes a second step of removing the abnormal odor source in the abnormal odor area following the first step.

[0032] Examples of the sources of abnormal odors in the fire odor of a fire-damaged object include, for example, the burnt smell and attached soot of the fire. The method for removing the source of abnormal odor is not particularly limited. For example, after spraying a cleaning agent around the location where the source of abnormal odor is attached, the source of abnormal odor may be removed by polishing. The location where the source of abnormal odor is removed is not particularly limited. For example, it includes the floor, dirt floor, wall, column, ceiling, concrete structure, floor base member, wall base member, column base member, ceiling base member, etc. inside the building.

[0033] The cleaning agent is not particularly limited. However, for example, when using ethanol, an alkaline cleaning agent, or an acidic cleaning agent, the sprayed area of the cleaning agent can be disinfected simultaneously. If the cleaning agent contains an abrasive such as Scotch-Brite (manufactured by 3M), the removal of the source of abnormal odor is more effective and preferable. Since the cleaning agent may be difficult to remove when it adheres to members such as the floor, wall, column, and ceiling (e.g., wood, tile, plasterboard, resin, etc.) due to dripping, it is more preferable to contain a thickening agent such as butyl diglycol to delay the dripping. The polishing method is not particularly limited. However, conventional disk sander electric polishing is not very preferable because there is a risk of damaging the concrete structure and hair cracks (cracks).

[0034] When proteins and lipids are attached as the source of abnormal odor, the method for removing abnormal odor inside the building of the present embodiment may further include a step of cleaning the attachment location of proteins and lipids using a cleaning agent containing a degrading enzyme such as protease and lipase between the first step and the second step. When the attachment location is concrete, an alkaline cleaning agent is preferable because using an acidic cleaning agent may cause efflorescence (whitening phenomenon) and make removal difficult.

[0035] <The Third Step (S3): Coating> The method for removing abnormal odor inside the building of the present embodiment includes a third step of coating the location where the source of abnormal odor has been removed with a resin paint following the second step. By the third step, it is possible to prevent the return of residual odor in the first to second steps due to moisture, humidity, etc.

[0036] The resin paint used for coating is not particularly limited, and examples thereof include one or more selected from organic resin paints such as acrylic resin paint, epoxy resin paint, urethane resin paint, and fluororesin paint, water-based resin paint, powder resin paint containing a cement admixture, and the like. The coating method is not particularly limited, and examples thereof include roller coating, brush coating, spray coating, and the like.

[0037] <Fourth step (S4): Spraying hot water at 40°C> The method for removing abnormal odors in the building according to this embodiment includes, following the third step, a fourth step of spraying hot water at 40°C on the abnormal odor area. The reason why the temperature of the hot water being 40°C is appropriate is that the temperature range and humidity where protein-based putrid odors (human, garbage, pet) are likely to be felt are in an environment of 30°C or higher and humidity of 60% or higher.

[0038] The environment of 30°C or higher and humidity of 60% or higher refers to the temperature and humidity in summer. The reason why cases of solitary death are likely to be discovered in summer is related to the above temperature and humidity. Also, when cleaning protein-based contaminated areas, it is easier to clean in summer than in winter. This is because it is a temperature range where lipids are easily neutralized and decomposed.

[0039] With hot water at 40°C, it is possible to open the pores on the surface of building materials (gypsum board, wood, concrete). When the hot water is at 50°C or higher, it may cause thermosetting or deteriorate the packing of the pressure-type spraying machine, so around 40°C is suitable. Thus, the temperature of the hot water is preferably 40°C, but the same effect can be achieved if it is between 35 and 45°C. In summer, the indoor temperature may reach 40 to 50°C, and in this case, the same effect can also be achieved by spraying water at 20 to 30°C.

[0040] Note that electricity is required to boil hot water at 40°C, but temporary power supply is possible even outside the workroom. In this case, large-scale mechanical equipment like those in Patent Documents 1 and 2 is not necessary, nor is a constant power supply required.

[0041] <Fifth step (S5): Spraying deodorant> The method for removing abnormal odors in a building according to this embodiment includes, following the fourth step, a fifth step of spraying a deodorizing, neutralizing, and decomposing agent on the abnormal odor area. General deodorants only temporarily deodorize in a way that overwrites the smell of the odor, rather than eliminating the source of the odor. In contrast, the deodorizing, neutralizing, and decomposing agent neutralizes and decomposes the nucleus (DNA), which is the source of the odor, to eliminate the odor. That is, the deodorization persists as long as there is no new source of the odor.

[0042] The deodorizing, neutralizing, and decomposing agent is composed of plant-derived components, and the plant-derived deodorizing components react with functional groups such as ammonia and hydrogen sulfide to decompose and deodorize. The deodorizing, neutralizing, and decomposing agent means that a chemical reaction occurs between the malodorous substance and the deodorant component, resulting in a change to an odorless substance. Also, the deodorizing, neutralizing, and decomposing agent neutralizes acidic odor molecules with alkalinity and neutralizes alkaline odor molecules with acidity. By chemically decomposing in a neutral state, the chemical composition bonds of the odor substances are decomposed to deodorize.

[0043] After significantly reducing the abnormal odor through the first to fourth steps, by the fourth step of spraying the deodorizing, neutralizing, and decomposing agent on the abnormal odor area, it is possible to remove the fire odor, viruses, etc. remaining in the building while reducing damage to the human body, animals and plants, leather products, electrical products, etc.

[0044] In this embodiment, in addition to hot water at 40°C, the deodorizing, neutralizing, and decomposing agent is sprayed. With hot water at 40°C, the pores on the surface of building materials (gypsum board, wood, concrete) can be opened. Also, by utilizing the osmotic pressure generated by using hot water and the plant-derived deodorizing, neutralizing, and decomposing agent, the abnormal odor area can be effectively deodorized.

[0045] In this embodiment, different from the deodorizing method mainly using deodorants, since a large amount of hot water is used, the amount of deodorant used can be significantly reduced, taking environmental considerations into account. The deodorizing neutralizing and decomposing agent is composed of plant-derived components, and the plant-derived deodorizing components react with functional groups such as ammonia and hydrogen sulfide to decompose and deodorize. In addition, since the deodorizing neutralizing and decomposing agent also passes the metal corrosion test, fiber bleaching test, oral toxicity test, residual pesticide detection test, and harmful heavy metal detection test, there is a remarkable effect that even those engaged in deodorizing work can perform deodorizing work safely. Further, according to this embodiment, as shown in Patent Documents 1 and 2, since equipment investment such as an ozone generator and a hydroxyl generator is not required, there is an advantage that anyone can deodorize easily with a low budget.

[0046] (2) In the case of the putrid odor of the accident site <The first step (S1): Disinfection> In an accident site, various pests, bacteria, and viruses may occur and spread in the odor source. Therefore, in order to ensure the safety of cleaning workers, the method for removing abnormal odors in the building of this embodiment includes a first step of disinfecting the abnormal odor area in the building.

[0047] The disinfectant used for disinfection is not particularly limited as long as it is generally used for disinfection. For example, an aqueous solution of a compound having oxidizing power such as stable chlorine dioxide can be mentioned. The spraying method of the disinfectant is not particularly limited, and it may be spray-sprayed over the entire abnormal odor area in the building, or may be sprayed intensively on the odor source.

[0048] <The second step (S2): Removal> The method for removing abnormal odors in the building of this embodiment includes a second step of removing the odor source in the abnormal odor area following the first step.

[0049] Examples of the odor source in an accident site include the putrid odor when human or animal carcasses and feces are left unattended for a long time. The method for removing the odor source is not particularly limited. For example, after spraying a cleaning agent around the location where the odor source adheres, the odor source may be removed by cleaning.

[0050] The location where the odor source is removed is not particularly limited. For example, it includes the floor, dirt floor, wall, pillar, ceiling, concrete structure, floor base member, wall base member, pillar base member, ceiling base member, etc. inside the building. The cleaning agent is not particularly limited, but the putrid body fluids and blood, etc. (odor source) from the corpse are viscous and difficult to remove when adhering to the members (such as wood, tiles, plasterboard, resin, etc.) that make up the floor, wall, pillar, ceiling, etc.

[0051] Therefore, it is preferable to use a cleaning agent containing, for example, protease, lipase or a cleaning agent containing protein and lipid degrading enzymes, as the odor source can be decomposed and removed. When the adhesion location of the odor source is concrete, an alkaline cleaning agent is preferable because the use of an acidic cleaning agent may cause efflorescence (white efflorescence phenomenon) and make removal difficult.

[0052] <The Third Step (S3): Coating> The method for removing odors inside the building of the present embodiment includes a third step of coating the location where the odor source has been removed with a resin paint following the second step. By the third step, it is possible to prevent the residual odor from returning in the first to second steps due to moisture, humidity, etc.

[0053] The resin paint used for coating is not particularly limited. For example, it includes one or more selected from organic resin paints such as acrylic resin paint, epoxy resin paint, urethane resin paint, fluororesin paint, water-based resin paint, powder resin paint containing a cement mixture, etc. The coating method is not particularly limited. For example, it includes roller coating, brush coating, spray spraying, etc.

[0054] <The Fourth Step (S4): Spraying Hot Water at 40°C> The method for removing odors inside the building of the present embodiment includes a fourth step of spraying hot water at 40°C in the odor area following the third step. The reason why the temperature of the hot water being 40°C is appropriate is that the temperature range and humidity where protein-based putrid odors (human, garbage, pet) are easily felt are in an environment of 30°C or more and humidity of 60% or more.

[0055] An environment with a temperature of 30°C or higher and a humidity of 60% or higher refers to the temperature and humidity in summer. The reason why cases of solitary death are likely to be discovered in summer is that the above temperature and humidity are related. Also, when cleaning protein-based contaminated areas, it is easier to clean in summer than in winter. This is because it is a temperature range in which lipids are easily neutralized and decomposed.

[0056] In the case of hot water at 40°C, the pores on the surface of building materials (gypsum board, wood, concrete) can be opened. When the hot water is at 50°C or higher, it may cause thermosetting or deteriorate the packing of the pressure-type sprayer, so a temperature around 40°C is suitable. Thus, although a hot water temperature of 40°C is preferred, the same effect can be achieved if it is between 35 and 45°C. In summer, the indoor temperature may reach 40 to 50°C. In this case, the same effect can also be achieved by spraying water at 20 to 30°C.

[0057] Note that electricity is required to boil hot water at 40°C, but a temporary power supply is possible even outside the workroom, and large-scale mechanical equipment like those in Patent Documents 1 and 2 is not necessary, nor is a constant power supply required.

[0058] <The Fifth Step (S5): Deodorant Spraying> The method for removing abnormal odors in the building of this embodiment includes, following the fourth step, a fifth step of spraying a deodorizing and neutralizing decomposition agent on the abnormal odor area. General deodorants do not deodorize from the source of the odor but overwrite the smell of the odor to temporarily deodorize. In contrast, the deodorizing and neutralizing decomposition agent neutralizes and decomposes the nucleus (DNA) that is the source of the odor to deodorize the odor. That is, the deodorization persists as long as there is no new source of odor.

[0059] The deodorizing neutralizing and decomposing agent is composed of plant-derived components, and the plant-derived deodorizing components react with functional groups such as ammonia and hydrogen sulfide to decompose and deodorize. The deodorizing neutralizing and decomposing agent means that the malodorous substance and the deodorizing agent component undergo a chemical reaction and change into odorless substances. Also, the deodorizing neutralizing and decomposing agent neutralizes acidic odor molecules with alkalinity and neutralizes alkaline odor molecules with acidity. By chemically decomposing in a neutral state, the chemical composition bonds of the odor substances are decomposed to deodorize.

[0060] After significantly reducing the abnormal odor through the first to fourth steps, by the fifth step of spraying the deodorizing neutralizing and decomposing agent in the abnormal odor area, while reducing damage to the human body, animals and plants, leather products, electrical products, etc., it is possible to remove the fire odor, viruses, etc. remaining in the building.

[0061] In the accident site, putrid body fluids, blood, feces, etc. (odor sources) from the corpses may penetrate into the structures of the building such as the floor, wall, column, ceiling, etc., and in the second step, it may not be possible to completely remove the pollution source. In this case, the method for removing abnormal odor in the building of the present embodiment preferably includes a sixth step of disassembling the structure between the second step and the third step to expose the odor source penetrating into the structure, and a seventh step of removing the exposed odor source.

[0062] <The sixth step (S6): Disassembly, exposure> The structure to be disassembled is not particularly limited, and examples include surface members (wood for flooring, tatami mats, tiles, carpets, cushion floors, etc.) covering the floor, wall, column, ceiling, etc. The structure of the building (base member) to which the odor source exposed by the disassembly adheres is not particularly limited, and examples include plywood, concrete, mortar, iron plates, gypsum boards, beams, floor edges, floor edge supports, etc.

[0063] <The seventh step (S7): Removal> The method for removing the odor source is not particularly limited. For example, after spraying a cleaning agent around the location where the odor source adheres, the odor source may be removed by cleaning. The cleaning agent is not particularly limited, but the putrid body fluids, blood, etc. (odor source) from the corpse are viscous and difficult to remove once they adhere to the members (such as wood, tiles, plasterboard, resin, etc.) that make up the floor, walls, pillars, ceiling, etc.

[0064] Therefore, it is preferable to use a cleaning agent containing, for example, protease, lipase, or a cleaning agent containing protein and lipid degrading enzymes, as the odor source can be decomposed and removed. When the adhesion location of the odor source is concrete, an alkaline cleaning agent is preferred because using an acidic cleaning agent may cause efflorescence (whitening phenomenon) and make removal difficult.

[0065] When the odor source adheres to household goods such as futons, clothes, tatami mats, daily necessities, and electrical appliances, the second step or the seventh step may further include a step of sealing and packing or carrying out the household goods to which the odor source adhered after removing the odor source by cleaning. As the material used for sealing and packing, polyethylene or vinyl chloride is preferred to prevent the odor source, pests, bacteria, etc. from scattering, and the thickness is preferably 0.05 mm or more.

Explanation of Symbols

[0066] S1 First step, S2 Second step, S3 Third step, S4 Fourth step, S5 Fifth step, S6 Sixth step, S7 Seventh step.

Claims

[Claim 1] The putrid odor caused by human or animal carcasses or excrement left for a long period of time adheres to the surface of building materials in a building. A hot water spraying step of spraying hot water at 40°C in an environment with a humidity of 60% on the odorous area; After the hot water spraying step, a deodorizing neutralizing decomposition agent spraying step is performed in the off-odor area, in which a deodorizing neutralizing decomposition agent is sprayed, the deodorizing agent being composed of a plant-derived component and reacting with a functional group to decompose and deodorize putrid odors. A method for removing unpleasant odors in a building, comprising:

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