I created a lattice of coper wire in place of the bottom of an old 5 gallon bucket.
Click to view attachment
Click to view attachment
I then put the sacrificial steel in the bottom of another 5 gallon bucket.
Click to view attachment
Add some washing soda.
Click to view attachment
Plug in a 4amp transformer.
Click to view attachment
I let it run until the bubbles stop which can be a couple of days, turning the parts periodically.
Click to view attachment
I'm surprised and pleased by how well it works. Any metal that is touching the copper wires or touching another piece that is touching the copper wires gets cleaned. If I have small parts like nuts or washers I just thread them together on a loop of copper wire and drop it in.
George