Birchwood Casey Lead Remover & Polishing Cloth works great on removing the carbon rings found on the front of my SS revolver cylinders without much work at all....no brushes required period!
After read this thread I got some bore tech eliminator. All I can say is, WOW! This stuff works, the first patch through comes out bright blue. No ammonia stink too!
My all-time favorite as I mentioned earlier is Bore Tech Eliminator. Once in a while I will use 75% Shooters Choice and 25% Kroil for old times' sake. Years back it was a favorite of the BR shooters.