For muzzleloaders. I use Ivory Liquid followed up by several shots of boiling water (one teakettle.) Leave the percussion nipple on. Use a potholder to grab barrel. Run several patches. I use a .5 inch dowel with jags carved in the end. Repeat twice, then run Four-in One oil about 10 times. Alternate with WD-40 and Rem Oil.
Remove stock and go over barrel with liberal amounts of WD-40 and a cloth. Go over any rust or black powder corrosion with fine steel wool (tends to remove blueing a little, but not bad.) Remove nipple with nipple wrench and swab out threads with Rem Oil using a Q-Tip swab.
Spray down lock with WD-40 and Rem Oil. Wipe down and reassemble. Finish up barrel with a Bore Honey patch for storage. Rifle or pistol must be cleaned within a two day period after firing, or barrel will corrode. (For in the field, WD-40 or Rem Oil patches work fine after every three or four shots, or at the end of the shooting session or hunt.) If I'm hunting I always fire the shot off into the ground upon returning to camp rather than keep loaded or attempt to remove bullet with a "screw."
Hang on wall and repeat oil cleaning every every six months. NEVER leave loaded!!!!!!!!
Les
Tip for stock treatment in rainy weather: Apply clear Kiwi shoe polish or beeswax to stock to seal it from cracking when it dries out.