After shooting BlackHorn 209 or any powder for that matter,I find that the breech plug grease is every where. So I dip a patch in solvent and wipe the plug off as much as possible. I then take some Q-tips, dip them as well and clean out the insides of the breech plug. After all that I like to take them to the sink. With dish soap and an old tooth brush, I get hot water running, submerge the plug, pour a little soap on it, and brush the threads real clean. After I have every trace of fowling off, I rinse it. Then back for another solvent patch and finally dry patch it. If you have access to an air compressor as I do, I like to blow the plug dry and the hole clear.