Originally Posted by PerL

So basically, you immerse the metal in water, hook up a battery charger's positive side to a conductor separate in the water, and the negative side to the part itself? Hmm, guess I gotta try this out

I read of another trick, to use vinegar. I've tried this myself, but it didn't work out as shown in this link. I guess my vinegar may have been dilluted.

http://www.cookhaus.co.uk/vinegar/index.htm