Pyrodex does not build up fouling so as to affect the shooting, but the residue is, at least under some conditions, MORE corrosive than black. Hodgdon sells their own cleaner and there are numerous other brands and recipes. I went out with a BP shooter and his .50-70s (an 1870 Trapdoor and an 1863 Sharps - 1868 cartridge conversion) this morning, and he cleaned them with Windex All Surface with Vinegar. Followed by drying and oiling, of course. He uses the same for his $3000 Shiloh Sharps and it still looks like new after years of competitive shooting. But that is with real Black.
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