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Since I was replacing my front brakes with disc brakes and would not be needing the origional backing plates I used them for my salvage pieces. Took a piece of rebar bent at both ends and welded it to the plates. A second piece stick up out of the water to make for an easy connection.

Drop this down in the tub with the parts to be cleaned between them and apply your current. The current flow between the parts is strong and rust come off quickly. I let an exhaust manifold sit for about eight hours and was shocked. After washing it off it looked like new cast.

I have also found that adding a little LYE to the mixture works as an excellent degreaser and many old paints will dissolve or flake off as well.