A non-abrasive chemical solvent specifically designed to remove all forms of bore fouling including copper with an absolute minimum of effort. It will quickly remove carbon build-up even in that "difficult to clean" throat area. It will easily remove lead, was and even plastic from shotgun wads. Pushing a few patches soaked with Butch's will control copper build-up. Butch's is safe to use on carbon and stainless barrels.