I had a rifle that copper fouled bad anyhow used my usual gunslick foam let it set nothing wouldnt put a dent in the copper. I go 2-3 days scrubbing with it, switched to another gunslick product the liquid copper remover and brushes [bleep] still 2-3 days of cleaning. So bought some montana extreme bore paste and liquid bore cleaner. Holy smokes talk about fumes i would be out in the garage scrubbing with this stuff my wife come out go whew it stinks and go back inside. That stuff worked ok, so i switched to sweets that stuff stank just as bad as montana extreme stuff and it worked ok. Then i went with barnes cr-10 it stank as well didnt work very well. Then i read about wipeout tried the foam stuff and wow it worked no brushes. Then i found wipe out liquid accelerator and liquid wipe out use them both. So for me the wipe out products oh and they dont stink i clean my rifle in the house and not get high on ammonia!