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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 38,159
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I imagine that wheel was pretty well loaded up with brake mung beforehand. I can offer this, if the detailer couldn't/wouldn't remove that then it's likely that the wheel finish will be damaged when you do find something that will eat it.
Normally a light acid is used, YMMV.
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