I use electrolysis all the time for rusty parts & tools. It will take paint off pretty good too. I watched a video where a guy did an entire tractor. Used a big pond liner & made like an above ground pool.
Biggest I've done is those hard plastic kiddie pools they have at the grocery store, for some tripod mounted belt fed parts. Like my little pic to the left.
And I use Arm & Hammer washing soda & rebar. I sandblast the rebars first & between uses.
I'm helping at the soup kitchen and I figured the 5 gallon capacity would help....
No, I wanted a smaller one but don't let these chumps on ebay fool you. I ordered 4 other ones but made them cancel the orders when they couldn't give me a ship date. Most of the sellers do NOT have any of these in stock. I will find a small one just big enough to fit a control board into. Then I can deal with the smaller solution costs.