This cheap and easy method for removing rust stains on concrete comes directly from an editor's hands-on, DIY experience. The ...

It has brown, rust-colored stains that don’t come off ... and get down to bare metal. Then you can start over to build up a few layers of oil, which will make the pan close to nonstick.

That way, there's no further rusting from the acid because the acid does attack the metal slightly. Then it'll be pressure washed until all of the rust is removed. Once all the rust is removed ...