I recently viewed and saved a post regarding modern day lens coatings. Took me a bit to find it…
https://lemmy.world/post/18532120
There’s also a particular comment in that thread that says what chemical they use to remove that coating. Check back soon and I’ll reply to this comment with a link to that particular comment…
Addendum, found the comment of interest…
https://lemmy.world/comment/11711303