Butch's Bore Shines in removing copper fouling.
That's it's specialty.
It has quite a bit of ammonia in it.
I use it mostly in rifles as a result.
Then a less strong solvent to get out the ammonia and whatever is left.
Then a preservant such as Eezox.
(You will be able to locate your weapons in the dark by the fragrant odor after using Eezox).
As stated above, trying to get a revolver back to looking brand new is counter-productive unless maybe you are trying to take pictures and sell it.
I just wipe off the cylinder face with a common solvent and leave the burn marks.
Do NOT use an abrasive.
(Not accusing anyone in here of trying that BTW. Ya'll know better.)
I bought a used revolver where someone did that.
While I lucked out and the function is good, it looks worse than usual.
Not sure what they had in mind or what exactly they did, but luckily they gave up before real damage was done.