Too bad those folks didn't realize that revolvers are filthy-shooting sidearms. Every time I use a revolver, I scrub it clean. And my .357 is the worst!
I'd use CLP and let it work for a while. I mix CLP with mineral spirits and soak AR parts and it cuts the crap pretty well. There are foaming cleaners that seem to work pretty well too.
Again, as you well know Paul, time is our friend when doing a good cleaning.