Patent ID: 9481857
Filing Date: 2016-11-01
CPC Classification: A47L,B08B,C11D

Claim Text:
1. A method of cleaning articles in a dishmachine comprising the steps of: applying a non-phosphate alkaline composition to articles in need of cleaning; and cleaning the articles by applying to the articles an acidic composition before or after application of the alkaline composition, wherein said acidic composition comprises from about 1,000 to about 4,000 ppm acid, from about 10 to about 50 ppm surfactant, and a chelating agent; and wherein the acid comprises urea sulfate and upon mixing with the non-phosphate alkaline composition forms a neutralized urea sulfate salt; wherein the chelating agent is selected from the group consisting of citric acid, MGDA, GLDA, glutamic acid, and mixtures thereof; wherein water required for the cleaning of articles in the dishmachine is reduced by about 50% by volume as a result of applying the alkaline and acidic compositions thereto; wherein the acidic composition generates a first acidic use solution and a second acidic use solution for cleaning, wherein the first and second acidic use solutions have the same concentrations of acid and surfactant, and wherein the first acidic use solution has a of about 2; and removing water hardness in the dishmachine with the acidic composition, wherein said urea sulfate reduces precipitation of calcium and/or magnesium present in the dish machine during the cleaning step.