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I would try some Simple Green. It's completely safe on metals and the black plastic bases. I haven't tried this on the normal grey plastic and I don't know if the black plastic bases are the same type, but I accidentally forgot an entire squad of half-painted kasrkin on bases in a tub of Simple Green for 3 years. They came out fine to my eyes when I rediscovered them a month back. Of course, all the glue had become soft and rubbery and the paint had fallen off and settled to the bottom in a sort of sludge. xD Had to scrub it off the bases since it had caked on after settling, but it came off easy enough. I don't know if this is related or not since I had bought them as was, but the models came out a dull grey color. Kind of looked like an older high lead content metal. I haven't done anything more with them, so I can take some pics if someone thinks they can tell me why they look so different from the normal white metal models.
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