Iosso Case Cleaner effectively removes powder fouling residue, oxidation, tarnish, discoloration, dirt and grime. It also cleans inside primer pockets and inside the casings where tumbling media isn't effective. To use, simply immerse the casings in the solution for 20 seconds to five minutes, rinse and dry. 1 qt. Treats approximately 1,500 casings. Removes powder fouling residue, oxidation, tarnish, and more Cleans primer pockets and case interior Treats up to 1,500 casings