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Well you added the photos after his response that you quoted.
They are fine but I can't tell from them what it is (I'd guess it's rust but it's not very consistent with your description of how it...

why don't you try toilet paper with oil. and don't touch the edge, you'll dull it.
i'm thinking it's not rust because you're drying it and covering it in oil, so it must be scum from the water and...