The use of a combination of peroxygenated bleaching agent and an acyl hydrazone of general formula I, in which R 1 is a C 1-4 alkyl group that bears a substituent in which R 10 represents hydrogen or a C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl group and A - is the anion of an organic or inorganic acid, R 2 represents hydrogen or an optionally substituted C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-28 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl, phenyl, naphthyl or heteroaryl group, and R 4 represents hydrogen or a C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl group or an optionally substituted phenyl or naphthyl or heteroaryl group, R 5, R 6, R 7 and R 8 represent, independently of one another, R 1, hydrogen, halogen, a hydroxy, amino, an optionally substituted N-mono or di-C 1-4 alkyl or C 2-4 hydroxyalkyl amino, N-phenyl or N-naphthyl amino, C 1-28 alkyl, C 1-28 alkoxy, phenoxy, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl, phenyl or naphthyl group, wherein the substituents are selected from C 1-4 alkyl, C 1-4 alkoxy, hydroxy, sulfo, sulfato, halogen, cyano, nitro, carboxy, phenyl, phenoxy, naphthoxy, amino, N-mono or di-C 1-4 alkyl or C 2-4 hydroxyalkyl amino, N-phenyl or N-naphthyl amino groups, or R 5 and R 6 or R 6 and R 7 or R 7 and R 8 are interconnected so as to form 1, 2 or 3 carbocyclic or O-, NR 10 - or S-heterocyclic, optionally aromatic and/or optionally C 1-6 alkyl-substituted rings, in order to improve the antimicrobial effectiveness of washing and cleaning agents, characterized in that a compound forming a peroxycarboxylic acid under perhydrolysis conditions is used together with the acyl hydrazone of general formula. in which R 10 represents hydrogen or a C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl group and A - is the anion of an organic or inorganic acid, R 2 represents hydrogen or an optionally substituted C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-28 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl, phenyl, naphthyl or heteroaryl group, and R 4 represents hydrogen or a C 1-28 alkyl, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl group or an optionally substituted phenyl or naphthyl or heteroaryl group, R 5, R 6, R 7 and R 8 represent, independently of one another, R 1, hydrogen, halogen, a hydroxy, amino, an optionally substituted N-mono or di-C 1-4 alkyl or C 2-4 hydroxyalkyl amino, N-phenyl or N-naphthyl amino, C 1-28 alkyl, C 1-28 alkoxy, phenoxy, C 2-28 alkenyl, C 2-22 alkynyl, C 3-12 cycloalkyl, C 3-12 cycloalkenyl, C 7-9 aralkyl, C 3-20 heteroalkyl, C 3-12 cycloheteroalkyl, C 5-16 heteroaralkyl, phenyl or naphthyl group, wherein the substituents are selected from C 1-4 alkyl, C 1-4 alkoxy, hydroxy, sulfo, sulfato, halogen, cyano, nitro, carboxy, phenyl, phenoxy, naphthoxy, amino, N-mono or di-C 1-4 alkyl or C 2-4 hydroxyalkyl amino, N-phenyl or N-naphthyl amino groups, or R 5 and R 6 or R 6 and R 7 or R 7 and R 8 are interconnected so as to form 1, 2 or 3 carbocyclic or O-, NR 10 - or S-heterocyclic, optionally aromatic and/or optionally C 1-6 alkyl-substituted rings, in order to improve the antimicrobial effectiveness of washing and cleaning agents, characterized in that a compound forming a peroxycarboxylic acid under perhydrolysis conditions is used together with the acyl hydrazone of general formula.