Lye (sodium Hydroxide) drain cleaner.....etc is something I use to remove rust from tools I accidently left out etc.....it will remove rust without eroding meatal like acid will do.

Wash the hell out of it and it won't poison you. You will have to reseason the item however and thats going to be a drag until its done.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche