Otis Technology O12-PL Shotgun Blend Plastic Remover (4-Ounce) Efficient gun cleaning solvent by Otis Technology Specifically blended for shotguns of all gauges Effectively removes plastic, carbon and copper fouling from your firearm Cleans fouling from forcing cone, barrel and choke in one step Biodegradable and ammonia free Removes plastic lead and carbon fouling with ease Clean fouling from the forcing cone barrel and choke with one blend Safe for the environment  biodegradable ammonia free