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I left my empty cast iron pan on the stove top for 2 1/2 hrs. My problem is not a rusty residue, but black that continues to wipe off. What can I do? I have washed with steel wool, rinsed well, but when I wiped with oil, the paper towel continues to wipe black.

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Fully clean it

The residue is burnt seasoning (fats) that you haven't fully removed yet. It takes a surprising amount of effort, but this article describes how to completely strip your pan so that you can re-season it.

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