[ducktapeguy]

That method works wonders, I used it to de-rust a bunch of parts before painting. It's not as effortless as it seems though, you constantly have to keep the electrodes free of crap or it loses effectiveness, and it takes a while. Also it leaves behind some disgusting crap in the bucket. But for intricate parts it's great. I used powered dishwashing detergent as the solution, and try and put the part and electrode as close as possible for quicker results.

The rust converts to a black film that just falls off with a light wipe from a paper towel. You do have to immediately paint or protect the newly de-rusted parts or it will start oxidizing immediately.