[Buffalochip]

Jack is right, hot soapy water and a stiff bronze brush if it is really dirty. The Hoppes #9 is for smokeless powder firearms, not black powder or Pyrodex. Best to remove the barrel, stick the breech end in a bucket of hot water, dump some dish detergent down the barrel and run a bronze brush down it a few times to knock out the crud and then use a bore swab to pump water in and out of the nipple (or vent hole if flintlock) until the water runs clean. The pour boiling water down the barrel to rinse it out well. The barrel should then be super hot and will dry itself when stood on end. (Aussies use hairdryers, but then they also wear those odd hats and talk funny.) When it is dry, run an oily patch down the barrel to keep it from rusting.