Today when cleaning my muzzleloader using the recently new method of applying hot water after shooting, drying it off, and applying bore butter inside the barrel and rust preventive on the outside of the barrel. I noticed, Could be mistaken here, that the black powder was kinda hardened on. It could be some that was there before I used the hot water but i want to be sure. I began to look at the black powder substitute I was using and I noticed that I had two different brands, one that was sulfer free and it states water clean up, and the other (which I shot that day) that contained sulfer and did not state water clean up. So should I use a cleaning solvent when using substitutes with sulfer in them or can I still use hot water? What about black powder itself? Thanks for the help!