Iosso Case Polish cleans and polishes brass casings to a high luster. The polish removes powder fouling, residue, oxidation, tarnish, and discoloration. Iosso Case Polish leaves the casings with a highly polished look, and keeps them from tarnishing for a long time. You can also use the polish on casings that have been pre-cleaned with Iosso Case Cleaner. Add Iosso Case Polish to the media before tumbling. Add two tablespoons per pound of untreated meda, or one tablespoon per pound of pretreated media and tumble cases for about one hour. Heavily tarnished or dirty cases will need longer tumbling time. Now USDA Certified Bio-Based Formula. Mfg: Iosso Products