Patent ID: 7196044

Claim:
A warewashing detergent composition comprising: (a) a cleaning agent comprising about 0.5 wt. % to about 20 wt. % surfactant based on the weight of the detergent composition; (b) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 and obtained by diluting the warewashing detergent composition with water, and wherein the alkaline source comprises at least one of sodium hydroxide, potassium hydroxide, or mixtures thereof; and (c) a corrosion inhibitor in an amount sufficient for reducing corrosion of glass, the corrosion inhibitor comprising: (i) a source of aluminum ion; (ii) a source of zinc ion; and (iii) wherein the source of aluminum ion and the source of zinc ion are present in amounts sufficient to provide a use composition having a weight ratio of zinc ion to aluminum ion of at least about 2:1, and wherein the composition is provided as a solid as a result of extrusion or casting, and wherein the warewashing detergent composition comprises a block having a size of at least about 5 grams.