muzzle magic bore foam. Remove your breech plug, tilt the rifle so the muzzle is pointing at a downward angle and then give it 3 pumps and let it sit for 5 minutes and work. Do another 2 or 3 pumps and run a patch down the bore from the breech plug end.

Anytime you can remove the plug and push the fouling out the muzzle, do so. Pushing corrosive fouling into " muzzle to the breech" the threads of the breech plug area never sat well with me.