Originally Posted by ottothecow

The other stuff was soaked on oxalic acid...there are a lot of threads here you can read on how to do it, many link to a vintage bmx forum thread that I read before starting. Basically, I bought a tub of powdred wood bleach (oxalic acid) from ace hardware. Took out the parts I wanted to remove rust from and washed/degreased them fully since oxalic acid won't work on dirty parts. Then I threw them in a tub of hot tap water and through in a few pinches of the powder (maybe a tablespoon or two worth). Let them sit for a while, pull out and scrub with a scrub brush a little and then let sit overnight. Pull them out in the morning and wash clean (neutralize with baking soda if you want).