Thanks for all the advise. Have to stock up on a few new supplies now. You know I think I have a can of super lube that has teflon in it and it may have found it's way into the bore once if I couldnt put my hands on the BreakFree. I can see how that may lead to a build up. But for the life of me, unless a bronze brush is already dirty, I cant see how it will create dirty patches unless there is still something there to clean out. I'm trying to remember something a gunsmith told me once, I think it was about how hard it was to get everything out of a bore, and sometimes it took a soaking with mercury to release it.