I answered "Leave it alone, find a better one," but the "spend it" advise is really better. That puppy is corroded and beyond help. Sorry, but it's still a problem coin, even after you worked on it.
Distilled water soak and wooden toothpick can spot remove the verdigris sometimes. I just did a 40% silver Kennedy successfully.
I here ya if this was a BS, then I might try that. On a proof that is never an option, there will be evidence of the spot removal. Verdicare should desolve the verdigri. And if used right the evidence will be gone with a little aging.
I guess some of the TPG's now will strait grade MS70 treated coins. I might wait with this one and get some verdicare. Ya know throw it back in a flip. See how it ages?
I wouldn't send it to circulation, but I wouldn't really think much about it in my collection, either. If I had it, it would go to the water bottle with a few thousand others just like it.