We use Aqua Vantage 815 GD cleaner. We use it at a 1:10 rate and it cleans carbon like a CHAMP in the U.S. Cleaner. The only downside is you have to strip the rifle of all components that aren't metal. We put the receiver, barrel, and bolt assembly into the ultra sonic. Once out of the bath, rinse with water, wipe down, and apply CLP.