I would not buff it out! Clean it with a soft microfiber cloth or with a wet soft cloth with only a hint of dishwash detergent.
just put a fine cotton/silk cloth between the wedge and the screen.
I have cut out the protective Envelope where the wedge was coverd in the original package and put it on the wedge, whenever it's not needed.
Right now, when I know that i will not read in the dark, I remove the wedge out of the Cover - easiest thing to do.
take care
harry
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