Iosso Case Polish cleans and polishes brass casings to a high luster, removing powder fouling residue, oxidation, tarnish, and discoloration. Add Iosso Case Polish to your media before tumbling to reduce tumbling time. Plus, this polish also protects from re-tarnishing. Polishes brass casings to a high luster Removes powder fouling, oxidation, tarnish, and discoloration Protects from re-tarnishing