Save time on most paint projects by cleaning and etching all in one step. For heavily soiled surfaces the original krud kutter should be used as a pre-prep step, to remove excess oil, grease, and dirt. Excess rust should be removed with a wire brush. Krud kutter metal clean and etch is specially formulated to prepare iron, steel, zinc, aluminum, and galvanized surfaces for painting. Removes rust, oil, grease, and dirt. Eliminates paint peeling and other adhesion problems.