Patent ID: 6982241

Claim:
A cleaning composition comprising: (a) a product of mixing: (i) acid component comprising at least one of sulfuric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, imidophosphoric acid, thiocyanic acid, and mixtures thereof, wherein said acid component does not include nitric acid and wherein the acid component has a first pK a of about 2.5 or less; (ii) source of phosphoric acid component to provide phosphoric acid; and (iii) penetrant comprising an alkyl ethoxylated quaternary ammonium salt, a propoxylated quaternary ammonium salt, an alkyl ethoxylated propoxylated quaternary ammonium salt, an alkyl imidazoline quaternary ammonium salt, or mixtures thereof, wherein the cleaning composition is substantially free of hydrofluoric acid and provides cleaning and brightening of an aluminum surface.