When you clean your rifle, just remove the barrel and fill a deep sink with hot soapy water, dish washing detergent works well to clean black powder. Remove the nipple and put the breech end in the water and pot a patch on yor jag on the ramrod and move it up and down in the barrel changing patches perriodically untill the patch comes out pretty clean. Then run dry patches through the barrel till you get no more moisture, then put a light lube in the barrel and put the barrel back in the action and replace the nipple. The follow the advice of Cayugad. Some folks pour boiling water down the barrel after they clean it and the metal will flash dry from the heat. I never botheres with that.