How to remove grey stains from bathtub?

5 days ago

During our kitchen remodel, I had to use our bathtub to do dishes (back breaking!). I left several pans with soapy water to soak, and when I removed them, it left grey circular stains. Any idea what would remove them? I have tried white vinegar and separately The Works Tub and Shower cleaner. I believe the bottom of the pans are copper, if that helps.

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