A “lead away” cloth will do it all. Only use it on the face and inner window. Never use it on blues guns. FWIW I also stopped bothering and just use hoppes and a nylon brush to keep crud from thickening. It’s character of a well used revolver.
I will NEVER have enough so I guess I am doomed to clean carbon rings.I will repeat what I said earlier.
Once you have enough revolvers you will stop worrying about carbon rings on the face of the cylinder.
You don't have enough revolvers yet.
I understand that a lot of folks feel it is pointless to clean the cylinder face. I have a hard time not cleaning.