Surtec System, 1880 N. MacArthur Dr., Tracy, CA 95376
Phone (209) 820-3700 Fax (209) 820-3793
http://www.surtecsystem.com/home.htm
manufactures TILE BRITE - SCUM AND SCALE REMOVER (AC800000), a phosphoric acid solution. I use for construction cleanup (CCU) removal of mortar, etc. debris (it loosens sand.) I purchase under the name Fields Scale Remover.

Make sure you get a fabricating debris waiver signed before cleaning