The present invention discloses a biocidal composition comprising hydrogen peroxide in a concentration of 0.05-50% (w/w) and a compound with a structure according to Formula 1: R-O-(CH(Y)-CH2-O)n-CH2-COOH, wherein R is an alkyl or alkenylene radical containing 6-12 carbon atoms, Y is H or CH3, and n is 3- 10, in a concentration of 0.01-60% (w/w). An especially preferred compound according to Formula 1 is R is 6 or 8 and n is 3-8.