I agree with Eric except when it comes to revolvers. For years I shot pistol on the national range at Friendship. After a day of shooting [ around a 140 shots ] the inside parts were quite dirty and we would completely dissemble the pistol. I now shoot smoke on occasion in my Parker or Remington hammer guns and it's always fun. Everyone in my squad wants to try it, and the clean up only takes about 10 minutes as Eric described. I do hot soapy water with first a tornado brush then patches, clean hot water with patches, dry patch, WD-40 soaked patch, then a oiled patch.