I have been messing around with rust removal by electrolysis for quite some time. A while ago I imported some carbon graphite plates from Israel (e-Bay) to use as anodes. I tested them yesterday and they really made a great difference. The prosess is a lot cleaner and way more efficient than with iron anodes. This is the thermostat housing after 2 hours i the electrolysis and a very light cleaning of with a wire-brush.