If you go to www.kgcoatings.com they sell some great cleaning products, KG1 is a carbon solvent and it works great. The carbon under the scope mount wipes right off with a little on a rag, the same results anywhere there is carbon build up like the barrel around the chamber. To clean my comps I put some in a small bottle just slightly larger than the comp, fill it with KG1 and turn the barrel upsidedown with the comp in the solvent, after about 10 min or so the carbon is almost all gone what is left wipes right out. By clean I mean you can see the hard chrome inside the comp again. Put the cap on the bottle and it will last through many many comp cleanings. Then I spray it out with KG3 which is much better than brake cleaner or gun scrub, does not stink and easy on the hands. I know this sounds like a commercial but this stuff really works great, while you are at it try KG2 bore solvent you will never go back to Butches.