Well most black powder shooters have their own method for cleaning the bores I personally use black powder solvent and a half bucket of boiling water ,using a bristle brush on a cleaning rod with the barrel muzzle in the water and using the cleaning rod has a pump to clean out the bore. When the fouling is removed flush out the bore with clean hot water ,dry and oil has normal .For a muzzle loader the breech is placed in the water and the pump action draws the water into the bore through the nipplesFeltwad
I do this too but really don't fuss now.In fact I have three fouled guns simply swabb