Jerry wrote:

Hi Richard

I once made a small tub to hold the rusty part and filled it with a
solution of water and washing soda
(http://www.stovebolt.com/techtips/ru..._derusting.htm) . A
small DC current is then conducted from a metal part in the solution to the
rusty part. The rusty part got shiny after a few hours.

Jerry KD6JDJ

Neat idea. Washing soda (sodium carbonate) is sold at paint stores as
TSP substitute.

Roy Lewallen, W7EL