Oxidation Layer Help!

So I recently made the switch to all-grain and I'm getting ready for brew day tomorrow... When I washed my new pot, there was this black dirt on the inside so I boiled some water to clean it up a bit...

When I was done there was a brown layer up to the water level which I'm assuming was the oxidation layer.

When I wiped it dry, there was still the same black dirt all over the inside so I scrubbed it clean but that didn't fix it, and now I'm worried I scrubbed off the protective layer. I don't want my water to taste metallic!


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Scrub the pot with a gentle cleanser to remove the dirt. Rinse it very well and boil some more water in the pot to bring back the protective oxide layer.