Corrosion Technologies Bore Cleaner safely and efficiently removes every component of multi-layered bore buildup, including hydrocarbon resins, dust and dirt, salts, minerals, carbon and soft metal fouling. Brings pistol, shotgun and rifle (even black powder rifle) actions, bores and barrels back to mirror brightness. Bore Cleaner is completely safe on polymers, varnishes, soft metals and metal alloys, bluing, anodizing and all other known gun finishes. Odorless and clear, so you can easily see fouling and contaminants on the patch to know when your firearm is perfectly clean.