The invention relates to a microemulsion comprising: a) at least one ester, referred to as an odd acid ester, of general formula R1CO-O-R2 (I), in which: DEG R1CO- is an acyl group having a main chain comprising an odd number of carbon atoms of less than 19, DEG R2 is an alkyl group comprising from 2 to 5 carbon atoms, b) at least one additional fatty substance, different from each odd acid ester (I), and chosen from the group formed: DEG from monounsaturated aliphatic fatty acids, DEG from ethyl esters of monounsaturated aliphatic fatty acids, DEG from glycerol monoesters of monounsaturated aliphatic fatty acids, c) at least one nonionic surfactant chosen from the group formed from alkyl polyglycosides, d) at least one compound, referred to as a multifunctional cosurfactant, of general formula R6-CHOH-CHR7-NR8R9 (II), e) and water.