Unless it touches the forcing cone. It's a permanent decoration. You can soak it in Hoppes #8. Other then that, mechanically you can't remove it without rubbing through or scratching the blue. If it was stainless, Flizt metal polish takes it right off.
I wouldn't worry about it unless it starts to touch the cone.
I put some CLP on it and then gently use a bronze bristle toothbrush thingy. I wipe off and check frequently and I emphasize GENTLY. Must have the oil or this is a wasted effort.
Dude. You're giving me traumatic and tragic thoughts about removing carbon off a blued cylinder with a knife.
Somebody is gonna read this and try it. Then the revolver will end up at the pawnshop or the classifieds here. Then somebody will buy it and wonder what the hell happened.
It's how I clean mine and the cylinder face is fine. He asked how people cleaned them and gave my answer. Guess those old Blackhawks had a better finish than these fancy new guns.
Anyways, people can clean as they wish, I gave my answer.
Soak in Hoppes as earlier stated. Best thing would be a stainless version and my glass beader kept mine spotless..lol
Being it's a blued revolver soaking to soften is your only option to not harm your finish. STAY AWAY from anything with AMMONIA in it as that is like wiping a chalkboard with water. Bluing with come off quickly.
Darn, gave away my age huh, talking about wster and chalkboards