This concentrated Biodegradable Gel delivers penetrating deep-cleaning performance without noxious fumes or flammable liquids. It removes copper and lead deposits from the bore, powder residue and black-powder corrosion as well as plastic buildup from shotguns. And it removes rust without harming the gun's bluing.
I,ve used it "Blue Wonder" on several weopons, including a very ignored black powder pistol, always with excellent results. It's also prover useful on the exterior of a shotgun that had rust on the barrel. Couldn't recomment it enough.
Best bore cleaner and best rust remover. Use it with 0000 steelwool on surface rust and it will remove ALL of the rust and NO blueing. Gets even pitted rust out. Have saved/restored several antique guns and swords with this product. Heat the metal and then apply use steelwool and it WILL remove the blueing. Then use Blue Wonder Blueing and put it back better than it was to begin with. Unbelievable product..