http://www.ganoksin.com/orchid/archive/199708/msg00051.htm But I am
still in the dark about how much time and how much power.
I love John's description!
But for what it's worth, I do the same thing with the power supply I
use to anodize titanium. I reverse the polarity-- attaching the
steel strip that is my cathode to the positive wire-- set the
voltage to about 12 (like a battery), use an alkaline cleaner
instead of the TSP I use for anodizing, and clip the negative lead
to the silver object. My anodizer only draws about 1 amp or so, so
it is slow-- not much fizzing-- but the results are pretty much
instantaneous just the same.
The power supply cost only about $120, from this place:
You might not want to invest just to clean ionically, and I don't
know of any other use besides anodizing titanium or niobium, but I
thought I'd mention it just the same. (If you want to get one and use
it on reactive metals, get the one at the bottom of the page, that
goes up to 120 volts.)