Gun Carbon Foam Cleaner The Carbon Cleaner series was designed for cleaning carbon fouling off of rimfire and black powder gunmetal surfaces. Available in different package concepts, the Carbon Cleaner formula has found success with long gun shooters for decades. Description: The Carbon Cleaner series was designed for cleaning carbon fouling off of rimfire and black powder gunmetal surfaces Available in different package concepts, the Carbon Cleaner formula has found success with long gun shooters for decades