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I have numerous metal posts/bolts/screws/etc. that have what I can only call a black "stain" in spots. Nothing I have tried - metal polish, steel wool, dremel wire brush - seems able to remove this. Have any of you encountered this, and were you able to remove it with a session in the tumbler?
Here's a pic, I circled the worst but you can see a lot of it spotting in other areas. The photo makes it look lighter, it's really more black than this. These are typical, I have numerous parts like this off the same machine. I assume it's some sort of oxidation but it's not rust as you can see some rust over on the left wireform bracket.
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