Lucas Extreme Duty Bore Solvent & Ultrasonic Gun Cleaner is a premium blend of cleaning solvents and corrosion inhibitors. It easily removes carbon and powder residue from actions as well as copper and lead fouling from cylinders and barrels. The solvent based formula cleans deep to remove old oils and grease and provides a micro thin layer of rust and corrosion inhibitor on metal surfaces and bores. It is safe on polymers and factory applied firearm finishes.