Blue Wonder Gun Cleaner is a powerful concentrated gel that adheres to the surface for deep cleaning action. In the bore it completely removes copper and lead deposits, powder residues, and plastic build-up. It also removes black powder corrosion, leaving a chemically clean, bare metal surface in minutes. In addition, Blue Wonder Gun Cleaner will remove rust from the exterior finish of a gun and it will not harm or affect the bluing. It is completely non-toxic and bio-degradable.