Stained aluminum

I have some parts which were machined and cooled with an un-known lubricant. They've got black stains on them, and in some cases a powdery residue. Is there a simple/inexpensive way I can clean them?

Thanks, John

Reply to
sunshine-x
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The residue may be from exposure to water. If they haven't been anodized you could use Scotch-Brite pads. Randy

Reply to
Randy Replogle

It seems a good idea

Reply to
Aristide Libero Mombelli

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