Patent ID: 7919448

Claim:
A hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor; the corrosion inhibitor consisting essentially of: about 2 to about 85 wt-% water soluble calcium salt; about 10 to about 95 wt % water soluble magnesium salt; and about 2 to about 50 wt-% gluconate; wherein the weight ratio of water soluble magnesium salt to water soluble calcium salt is about 1-2:1-2; the weight ratio of water soluble magnesium salt to gluconate is greater than 1:1; the weight ratio of water soluble calcium salt to gluconate is about 1-19:1-13, and the detergent comprises less than about 0.5 wt-% phosphorous-containing compounds.