The neighbor that gave me the old wheel plow called me over the other day. He had found the original wrench that came with it. Of course after a few decades in his shop it was a bit rusty. I figured that the electrolysis dip worked well on the plow, so I'd try it again on the wrench.
After looking around the garage I settled on the top of a chicken water dispenser to hold the solution. I didn't really measure the washing soda this time, just threw a fistfull into the water. Once again, it's washing soda, not baking soda.
Instead of the rebar pieces I just coiled a piece of copper wire and suspended it in the solution with the wrench hanging from a wire in the middle.