Patent ID: 6165285
Filing Date: 2000-12-26
Classification: C11D

Abstract:
A method of cleaning marble or lacquered surfaces with an aqueous composition having a pH of 6 to 9, said composition comprising:(a) 0.1% to 30% of anionic surfactant, and(b) positive divalent ions selected from the group consisting of Mg.sub.2.sup.+, Ca.sub.2.sup.30 and mixtures thereof in an amount 0.05% to 4% by weight whereby the molar ratio of said ions to negative charges per mole of anionic surfactant is at least 2;(c) from about 0.05% to about 0.4% by weight of a carbonate of the formula XHCO.sub.3 where X is an alkali metal or ammonium ion;wherein said composition is free of polyphosphate builders and strong organic polycarboxylate builders, said strong polycarboxylate builders being those wherein the highest LogKa, measured at 25.degree. C./0.1M ionic strength is between 3 and 8, wherein the sum of LogKCa+LogKMg measured at 25.degree. C./0.1M ionic strength is greater than 4 and wherein LogCa equals LogMg.+-.2 units, measured at 25.degree. C./0.1M ionic strength, said method comprising the step of applying the said composition to said marble or lacquered surface and thereafter optionally removing said composition from said surface.