The present invention relates to a composition containing (a) a
guanidine and / or an unsubstituted
guanidine salt, and (b) at least one further component selected from the group consisting of 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 1, 2-benzisothiazolin-3-one, N-butyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, 2-benzisothiazolin-3-one, N-methyl-1, the
cleaning agent is prepared from 2-benzisothiazolin-3-one, octyl
isothiazolinone,
bronopol, dibromo-nitrilopropionamide, dibromo-dicyanobutane, butyl
carbamic acid iodopropynyl ester,
aminomethyl propanol, aminoethyl
propylene glycol, monoethanolamine,
ethylhexylglycerin, hexylglycerin, 1, 2-pentanediol, 1, 2-hexanediol, 1, 2-heptanediol, 1, 2-octylene glycol, phenoxy
ethanol and
phenethyl alcohol. The
cleaning agent is prepared from phenyl
propanol,
benzyl alcohol, isopropanol,
ethylenediamine tetraacetic acid, (1-hydroxyethylidene) diphosphonic acid, 2-mercaptopyridine
sodium oxide, 2-mercaptopyridine
zinc oxide, o-phenylphenol,
sorbic acid,
benzoic acid,
salicylic acid,
lactic acid,
citric acid and
zinc. The invention also relates to an industrial product containing components (a) and (b), and to the use of said composition for the preservation of containers and for the preservation of industrial products. The invention also relates to the use of (a) a
guanidine and / or an unsubstituted guanidine salt for improving the
antimicrobial efficacy of one or more compounds selected from the group (b) described above.