I bought a steam cleaner at Wal-Mart yesterday for $39 and tried it out on my blackpowder. I had some crud that I was having to work at to remove, hard, white rings, so I tried this steam cleaner. I took the barrel off and held it with a thick leather glove on and shot steam through it for a few minutes. Then I cleaned the barrell and threads to the breach - this worked amazing. It got so hot you couldnt touch it even for a split second.

Im sure this is not an origional idea, but this amazed me how well it worked. After a long shooting session I will do this every time.

The back of my number thirteen cleaner says to use scalding hot water through the barrell and Ive never quite figured a good way to do this without making too much of a mess and getting my scope unnecessasarily wet.