Karl Townsend wrote:
Iggy is right diluted muratic is fast and cheap, wants to re-rust. I stop it
with a squirt of purple engine cleaner (strong caustic) after a water rinse.
Still need to oil or paint.

For many parts I like phosphoric acid better. I buy it already diluted as
"Lime Away" cleaner at my local Fleet Farm. This works differently, it
converts rust to a black iron compound that won't re-rust. If you'd rather
pay more, you can get the same chemistry in Naval Jelly or rusty metal prep.

The electrolytic method others have mentioned is best for a small amount of
rust on a delicate part.

Karl



Define "small amount of rust" I have used electrolytic cleaning on car
frames, trailer frames and entire body shells.

The catch is knowing what to use. Baking soda doesn't work very well.
What you want to use is Washing Soda, AKA Sodium Carbonate, AKA PH Plus
pool chemical.

Fill the container with water. Now attach the wires to the parts and
toss them in the water. Now add the washing soda to the water until you
hit the maximum current those parts require (just watch the needle on
the power supply/charger) when the needle stops rising stop adding chemical.


--
Steve W.