Patent ID: 8895491

Claim:
A method of cleaning floors comprising: (A) forming a use solution by mixing water and from about 1 to about 0.5 ounces per gallon of water of a concentrated acidic cleaner, the concentrated acidic cleaner consisting of: (i) from about 1 to 60 wt.% of acid selected from the group consisting of citric, isocitric, tartaric, malic, monohydroxyacetic, acetic, gluconic and salts and mixtures thereof; (ii) from about 0 to about 80 wt.% of a buffering salt; (iii) from about 0 to about 40 wt.% of a surfactant; (iv) amine; and (v) caustic wherein the concentrated acidic cleaner has ratio of total acid to free acid of at least 2.5:1 and (B) applying the use solution to a floor.