How do I clean aluminum stock pot?

I used one of my aluminum stock pots on the woodstove to put some moisture back into the air (got very dry in the house). Now, there is hard water deposits baked onto the inside of the pot. I've tried metal cleaners, brillo, etc. to no avail. The water in our area is very hard and the iron and hard water deposits are baked on there pretty bad. Any suggestions? Is this pot trash now?

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