A multi-part kit system comprising (i) a solid part A which comprises 10 to 80 wt. % of peroxy compound selected from the group consisting of KHSO5, K2S2O8, Na2S2O8, magnesium monoperoxyphthalate hexahydrate, sodium percarbonate and sodium perborate, 0.1 to 10 wt. % of LiCl, NaCl and/or KCl and 1 to 20 wt. % of H2N(CH2)nSO3H with n=0, 1, 2 or 3, and (ii) a liquid part B in the form of an aqueous solution which comprises 0 to 20 wt. % of nonionic surfactant, 3.6 to 20 wt. % of amphoteric surfactant and 0.5 to 20 wt. % of at least one compound comprising substituted ammonium selected from the group consisting of dihydrocarbyl dimethylammonium chlorides or bromides, didecyl methyl-poly(oxyethyl)ammonium propionate, chlorhexidine gluconate, cetylpyridinium chloride or bromide, and polyhexamethylene biguanide hydrochloride, wherein at least one of the two hydrocarbyl residues comprises 8 to 18 carbon atoms.
