blairarnoldI could not find it either, was curious if it is a chemical agent as You do not want to use any chemical, liguid rust remover etc. on your cooking pan, it could transfer to food in cooking later on, probably won't kill you but food will get a nasty taste. We scorched a cast iron pan once and just cleaned it with coarse salt & water works fine same thing my Grandma always did as all she cooked with was cast iron. Bought a big Lodge fry pan about? 20" dia at garage sale cheap cause of rust, salt cleaned it up in no time.I found the "how to" section but never could find the rust removal tip, not even after doing a search in the site.