it's everywhere Alvin, all the antique machinery and tool sites recommend it ...
the main place everyone references is here now [moved awhile back]
then there's a ton of repeats:
http://www.thepontiactransampage.com/rust.html
http://www.ehow.com/how_2180910_washing-soda-electrolytic-rust-removal.html
http://antique-engines.com/electrol.asp

someone even U-tubed doing the inside of a gas tank

and of course it's right here at home:
http://www.stovebolt.com/techtips/rust/electrolytic_derusting.htm

make sure you have the polarity the right way round for it to work well, and use washing soda rather than baking soda for speedier action

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot