Cleaning dirty cylinder??
I shoot a couple of different S&W .357s and find that the cylinder gets some extreme powder residue buildup on top of each chamber just rear of the barrel. As the gun fires, the gas that makes it through the cylinder gap really makes a mess on the inside of the frame but is especially bad as it goes up and is diverted back down onto the cylinder.
I haven't had any luck using chemicals to clean this from my guns and wind up using my dremel with the buffing attachment and sometimes even a little buffing compound to get it off. This is effective but I wish there were a better way. Fortunately the guns have a polished stainless finish so I can't imagine what I'd do if they were blue or matte.
Is there anything that can be done to reduce the cylinder gap on say a S&W 686 or 66? My 66 is much tighter but that the 686 but I think it could be closer. IT seems like this would certainly reduce the mess.