I just use boretech eliminator, follow the directions on the back of the bottle, and send it. If I suspect a carbon ring, I'll fill the bore with CLR for 20 minutes, drain it, chuck up a nylon AR 15 chamber brush in a drill, and go to town. Patch out dry, then follow with the Eliminator regiment. As mentioned above. Everyone does it different. Pick a method that you like, and do it.