Dirtfarmer
I'm not sure that removing every bit of carbon or copper is necessary. On my guns, I have used the same cleaning method since they were new. I think that a gun that has been neglected or improper cleaning leads to layer after layer of carbon/copper. In those cases, the stuff I use might not work well. YOu can certainly be a better judge of whether something is clean or not with the borescope. Wish I had access to one.
