Patent ID: 6821351
Filing Date: 2004-11-23
Classification: C23F,Y10S

Abstract:
A method of cleaning or brightening a metal surface provided on a vehicle, the method comprising:(a) forming an aqueous acid stream by spraying water on a solid concentrate comprising a source of acid, wherein the source of acid comprises a strong acid; (b) forming an aqueous fluoride ion stream by spraying water on a solid concentrate comprising a source of fluoride ion, wherein the source of fluoride ion comprises a water-soluble fluoride salt or an acid-soluble fluoride salt; (c) combining the aqueous acid stream and the aqueous fluoxide ion stream as moving streams to from a moving stream of aqueous hydrofluoric acid solution; and (d) cleaning or brightening the metal surface provided on a vehicle by spraying the moving stream of aqueous hydrofluoric acid solution onto the metal surface.