How do I get rid of the black stuff on the bottom of this Dutch Oven/Pot?

Not sure what I'm looking at. Is it only caked on charcoal from sitting in a fire? Or maybe it's also badly rusted. You'll probably need to take a stiff wire brush to it, then go from there.

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It sounds odd, but if you slather ketchup all over the bottom (kinda thick layer) and let it sit for a while maybe even a day. Then scrape it off and depending on how bad it is, it should remove most of it. The acid in the tomatoes will erode it.