Jason, I suspect that the best way to strip the rest of the coating would be in either Hydrochloric and/or Aqua Regia (Hydrochloric + a little Nitric) This is dangerous stuff.

The coatings are applied in high vacuum apparatus, and you probably have to have it done by an optician... I assume they are glass?  if not, you may not be able to do this at all?

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