Cleans and polishes brass casings to a high luster. It removes powder fouling residue oxidation tarnish and discoloration. Add Iosso Case Polish to your media before tumbling. It works with the media to reduce tumbling time and gives your brass a like-new finish. Use Iosso Case Polish on soiled casings or on casings that have been pre-cleaned with the Iosso Case Cleaner.