Clean in place. Pull th nipples and substitute a drilled out nipple with som plastic tubing glued in place. Put end of tube in a bucket or pan of near boiling soapy water, get a tight fitting patch on a cleaning jag, wet the patch, insert in barrelto bottom and pull slowly. You will start moving hot soapy water up from the bucket and through the barrel. After a bit the barrell will get too hot to hold on to without gloves and the water issuing from the nipple will be clean. Patch it out with a couple of dry patches and let sit for a few minutes and then swab the bore with a patch with Thompson Center Bore Butter on it. Wipe down the externals with a bore butter patch and you are good to go. Take care to keep the hot soapies off of the wood. The above is the put it away for the week or season. I still usse Hoppes #9 Plus for black powder, or TC #13 bore cleaner, Remminton Vortex or similar product for overnight work.