Black powder I assume?
All black powder & substitutes clean the same....hot soapy water.
Revolvers: I remove the grips, drop the cylinder and dunk the entire thing in the kitchen sink full of hot water and dish soap, scrub then rinse in as hot a water as I can stand, immediately go to garage and use compressed air to blow dry. Oil everything good and reassemble. Only takes a few minutes.(some purists will frown at my method but while they're cleaning with tedious overpriced specialty products I'll be out shooting!)
Warning: kitchen will smell like rotten eggs and wife will will give you the stink eye!
