CopperzillaTM is designed to remove the most difficult copper and lead fouling quickly. If you shoot solid copper bullets in a long range rifle, lead slugs in a shotgun, or found Gunzilla to work slower than you wanted, use Copperzilla along with Gunzilla. Copperzilla will remove the most difficult copper and lead from the bore in 30 minutes. Then the weapon is cleaned with Gunzilla and you are done. Copperzilla can be left on any steel, stainless steel or chrome bore without etching the metal. Copperzilla is also made from natural based materials and has virtually no odor and no ammonia.