# Chemically removing rust without leaving any unwanted residues

I have this iron pan that got rusty from not being properly dried. Scrubbing it I was able to get rid of most of the rust, but there's still some I just can't remove. I thought I could chemically remove it, but I myself am a bit rusty on the inorganic chemistry subject, so I couldn't think of any way of doing it without leaving any unwanted residue on the pan.

The rust is the brownish-red type, which according to Wikipedia consists of $\ce {Fe2O3·nH2O}$ and $\ce{FeO(OH)·Fe(OH)3}$. Most rust-removal "recipes" I found involve all sorts of acids, but I can't tell what the reaction(s) would be with $\ce {Fe2O3·nH2O}$ so I can't tell if there would be any residues left behind that I could not remove. Anyone with any experience on the matter?

I contacted the manufacturer and the pan is hand-made, just Iron and natural coating (fat).

• After you remove the rust, dry out the pan on a hot burner on the stove after washing. This will prevent future rust. You have to keep a close eye on it so you can remove it from heat as soon as it is dry. – user20721 Sep 8 '15 at 15:05
• I would emphasize that for an iron pan, you need to re-coat "season" before drying to prevent rust. Otherwise moisture from the air will eventually start to rust the pan again. – Geoff Hutchison Sep 8 '15 at 16:24