It happens to lead, oxidizing and I would probably use a dremel tool and buff to clean it off, but there may be a easier way and not a way that will fill the air with that stuff like what I said I would do.
I hope someone here can tell you a good way and there probably is. There has to be a better way that want I said.
BTW that is why when someone orders unpainted heads on jigs from me I still clear coat them with Sally Henson's Hard as Nails.
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