Fellow I know just got a used Italian caplock rifle. Besides other minor problms, it has some kind of buildup in the barrel. I cleaned it at the range for him using patches & water, but the borelight still shows fibrous stuff hanging in the bore. I suspect someone used plastic sabots or (horrors) synthetic material patches. I was going to attack it w/ acetone & a brush, but does anyone have any suggestions for cleaning out this stuff? We are a fur piece from any fancy sportin' goods store, so it would have to be something fairly common.