no,my silver i give them a soak in hot soapy water and brush lightly. i end up with some dirt still on them but i figure if i sell them the dealer will clean them at his discretion better to get paid in full for your coin and have him make anymistakes than devalue the coin yourself. most of the roosevelts are worth only .60 in really nice shape anyway so unless you find a jar of proof coins they dont have a huge resale value .30 cents wholesale or less. but, again rather the dealer make the mistake and bring him a .30 cent coin than scratch the surface and end up with a .10 cent piece of silver hahaahha so this realy only applies to rare coins but i treat them all with the same respect i belive its just a good habit. sounds like this guy has built an electrolasys machine he is creating a current in the solution of salt and water softener by maign the metals react with each other. the trouble with this is that this is the same as electroplating only back words by pulling the tarnish off the silver you are also removing metal and i have heard that the effect does not last long, but i could be mistaken
