Alumamaze II is the only acid replacement product that cleans like hydrofluoric without the hazzards of hydofluoric acid. It is safe on most metals including aluminum, polished aluminum, copper, and stainless steel. It is classified as a non-irritant to skin. Alumamaze II is the leading edge clean health aluminum cleaner. It will safely remove road scale, film, soot and mineral deposits from aluminum and stainless steel. Great for aluminum trailers and tankers. Dilute up to 1:20.