hJust read about this in Handy. Using a battery charger, a plastic tub, water, iron or steel electrode, and washing soda you can remove rust from metal parts.
You use about 1/3 to 1/2 cup of soda per 5 gallons of water in a plastict tube. Make sure the battery charger is off and connect the positive teriminal to the electrode and negative to the piece that needs the rust removed. Be careful not to reverse this, for it could disolve the piece. Submerge the rust piece in the water solution and than insert the electrode into the tub so that it is partialy protruding from the water.
Set the charger to a low charge rate and turn it on. When small bubbles come off the work piece you know it is working. Moderatly rusty objects may take a few hours to become rust free while heavily rusted objects may be left overnight. When the bubbles stop forming turn off the power, remove the object and rinse thourghly. Treat with a light coat of oil to prevent flash rust from forming.
They give some web sites and I will try and type them in correctly.
I might have to give this a try.