I have recovered a few pre-1966 coin quarters with silver, they are oxidized pretty bad because of the iron minerals in Georgia clay. Can anyone steer me in the right direction how to restore these coins? Electrolysis? How too, articles? websites, etc?

My Homemade Electrolysis Set-up:
1/2 Gallon Plastic Bucket Of Water.
(2) Teaspoons Baking Soda.
Audiovox Cell Phone Charger (Output: 5.0 volts - 1.0 amps), Low and Slow.
(1) Piece Of Stainless (1/8" Thick x 3/4" wide x 10" Long) On Positive lead Alligator Clip - Do Not let Positive Alligator Clip Touch the Water, cause It Will Disintegrate right along with the Stainless Piece.
Item to clean on Negative lead Alligator Clip - OK to put the Alligator Clip in the water.
DO NOT let the Stainless Piece and the Piece to be Cleaned Touch Each Other.
You now have a Homemade Electrolysis Unit. See Attached Pictures.
I give props where they are deserved - Tytherelichunter is the person that I got this info from. He has a Blog on Google Blogger Titled Electrolysis...How To, Check it out.
AS HE STATES: You Are Working with Electricity So UNPLUG THE CHARGER BEFORE TOUCHING ANYTHING AND BE CAREFUL!!!!!!!!
This is as Quick Description of My Set-Up as I Can Give laughing7
Guy