Liquid disinfectant composition and use thereof

A liquid disinfectant composition in concentrated or diluted form, which comprises:

• an aliphatic-chain fatty acid having 8 to 12 carbon atoms or a mixture of such acids,
• glycolic acid, or a mixture of glycolic acid with acetic acid,
• a pH-regulating acid system, the type and amount of which is chosen such that the composition, in its diluted form, has a pH lower than 3.8, said pH-regulating acid system being selected from the group consisting of methane sulfonic acid, phosphoric acid, sulfamic acid, sulfuric acid and the mixtures thereof,
• an ethoxylated fatty alcohol of formula R—(O—C2H4)n—OH in which R represents a linear or branched alkyl group having 6 to 12 carbon atoms and n represents an integer between 4 and 8, or a mixture of such ethoxylated fatty alcohols;
• a copolymer of formula:
• in which x represents an integer between 2 and 15, y represents an integer between 15 and 35, and z represents an integer between 2 and 15;
• or a mixture of such copolymers,
• one or more surfactants,
• and water.