Originally Posted by mkeller234

Oxalic acid, aka wood bleach. Get the concentrated crystals, not the premixed deck wash. You can find it at paint stores like Sherwin williams for around 7-10 dollars. You will also need baking soda for a neutralizing bath and sponge to wipe the parts with.

For small parts I use plain old vinegar. Throw some rusty bolts in a can, let them sit for 2 days and rinse clean.

You need this stuff: