Patent ID: 7348302

Claim:
A cleaning composition comprising: (a) an acid package comprising a metal bisulfate and an inorganic metal sulfate salt, the inorganic metal sulfate salt being present in an amount sufficient to reduce formation of sulfuric acid when the acid package is in contact with water; the acid package being present in an amount sufficient to provide a brightening affect on a metal surface; (b) surfactant comprising a nonionic surfactant; and (c) from about 0.1 wt % to about 5 wt % of a foam boosting solvent selected from the group consisting of propylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol propyl ether, ethylene glycol butyl ether, diethylene glycol propyl ether, triethylene glycol methyl ether and propylene glycol methyl ether acetate; wherein the cleaning composition has a pH of about 1 to about 7.