Copper fouling, the bane of shooters, doesn't have to be a problem any longer- thanks to hoppes bench rest 9. With this powerful solvent, copper fouling can be cleaned from the bore overnight, instead of taking the standard 3 to 4 days. Bench Rest 9 is safe and effective and contains no abrasives. Although the solvent is essentially a copper buster, it's also great for removing powder, lead and plastic fouling from rifles, shotguns, pistols, and revolvers.