Many glues, especially those for price tags, jar labels, stick-on restroom signs, etc., soften very quickly with lighter fluid. Soften them and then wipe off with a rag or two depending on the size.
I have not tried it on sandpaper sticky. However, I would expect it to. Just dampen with lighter fluid. Then, very easily, scrape off with a putty knife, edge of a square shank screwdriver, sample credit card, or doggone near anything else. Wipe with rag dampened with the lighter fluid and wipe dry.
Enjoy,
JimB