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I can imagine how you feel.
There is a good chance it will clean off. The anti reflection coatings are usually a bluish or greenish colour and they do seem slightly fluid.
Some unscented white tissues and some Bintel cleaning fluid and some ery light rubbing would tell if it will lift or if its a scratch.
The front element is most likely crown glass and is pretty tough.
As others have said I doubt it will show up visually.
Greg.
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