Welcome! I have never seen shiny corners or heard of any solution. I’d be tempted to try pantyhose though, which I understand can, on occasion, get gum stains out. Might be something to research further or to test out if you have any commons in your collection.
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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