Walley World was having a 'close out' on some TC # 13 blackpowder cleaner, so cheap guy that I am I bought some, even came with patches, bore brush , and jag, all fer $ 2. ( reg $12 ,but that is why they were getting rid of it , nobody was paying 12 bucks for it )...... anyway, the #13 cleaner works real good, I mean a it cuts the crud out of a sooty barrel quicker than the French run from a fight.
I normally just use boiling water, scrub, more boiling water, let dry then finish with gun oil, but I must admit , that # 13 stuff does work.