An effective sonic cleaner - Hornady Lock-N-Load Sonic Gun Solution Gal

Used as directive, it is quite effective, particularly if you use the highest safe level of heat. A little goes a long way, in that you can reuse this cleaner several times, particularly if you simply strain off the largest carbon and dirt particles as you pour it into A Reserve container. I use plastic coffee creamer bottles, and mark the number of uses with a sharpie. After 5 uses, this product still remains quite effective.