I am not washing them, I just don't want to chance water in them.
I have a small concrete mixer that I am tumbling them in with silica sand. It cleans the dirt and powder residue off well, but I can only leave them in about 10 minutes tops. That doesn't get the brass very clean. Any longer starts to rough the plastic. After the silica I wipe them with a rag sprayed with silicone lubricant, slicks them right up.
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