I use a breach plug scraper to keep mine clean. They are available from such mail order places as Track of The Wolf, Dixie Gun Works, etc. When I am through shooting, I run my scraper down the bore and give it a few twists to remove any fouling on the face of the breach plug. Then I flush my bore with hot soapy water using one of the C clamp devices. They work fine, by the way. After flushing the bore, I run the breach plug scraper down one more time to make sure that all of the fouling has been removed. Some rifles have a powder chamber cut into the breach plug that is smaller than the bore. If you are unfortunate enough to have one of these, you will have to use a brass bush on the end of your cleaning rod that is small enough to fit down into the powder chamber and get the fouling out of it. Hopefully, yours will just have a flat faced breach plug and the scraper will be all you need.