It is easy to remove with the "Bore Tech" either eliminator(has copper as well as carbon remover) or their carbon remover but that is the only thing I have found to date. A long range shooter put me on it. I have tried letting it soak with Kroil oil over night. With my normal patches and jag it sounded like rubbing your fingers together when they are squeaky clean and patch came out with just a smudge. Today after a cleaning at range tried running a wet patch of ATF at suggestion of another shooter and it significantly reduced additional buildup and accuracy degradation.