Help with adhesive stains on poster
Wasn't sure where to ask questions or find information about this - let me know if there is another subreddit I should pose this question to.
Years ago I hung up this poster with these weird stretchy rubbery adhesive squares, but over time they have left these oily looking stains on the poster, bleeding through to the front. I don't really remember the name of the product but I seem to remember them being labelled as "archival quality" lol. The out of focus thing on my finger is the adhesive, and the rest of the funk is just dust. There is some blue tack residue on the back too, but as that isn'tt visible on the front I don't think it's relevant.
Is there anything I can do to get rid of these stains, or is it cooked? I definitely don't have the skills to do anything to really mask it. The poster itself is kind of a magazine cover quality - I have another poster I used these on that is more cardstock-like where these stains didn't appear.
I saw that vinegar is supposed to get rid of oil stains on paper, but I am worried about ruining the poster if I do that, plus I am not sure if this would even count as an oil stain.