Corbin Benchrest Bore Cleaner has been used by top shooters at Camp Perry and Wimbledon for over two decades. It is one of the "little known secrets" of the firearms trade, and is found in very few stores or retail outlets (only the very top specialty gun stores seem to know about it). It uses a mechanical prying action, of millions of tiny (15-20 micron) levers to lift and pry fouling of any composition from the bore. Since it does not rely on chemical reaction (the material is inert, with an oil base carrier), the type of fouling does not matter. Plastic, lead, copper, brass, even excess build-up of molybdenum disulfide from shooting too many "moly coated" bullets, can all be removed down to the steel barrel by stroking two inches forward, one back, until the patch and 1-caliber undersize brass brush around which the patch is wrapped emerge from the barrel (clean from breech if possible). Then wipe the bore with Corbin Five-Star Gun Oil to wipe out the bore cleaner, and you have the cleanest possible barrel.