Lysol Toilet Bowl cleaner is great for removing bluing, but I'm not sure it will touch that stuff. You may want to show it to a plating shop to see what they recommend, but be careful about electrical stripping because it could cause hydrogen embrittlement, or some such bad thing...
Radiator repair shops have some pretty good/strong dip tanks.
Have you tried commercial paint stripper, the caustic acid jell. stuff?
dju
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