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I have not tried the 3M remover, I have used Oil-Flo which is a commercial adhesive remover. The best way I have found so far is a brass brush in a drill. Use the brass version, not the steel as it is softer but will remove the glue. Do not leave it in one place too long or push too hard or it will dig into the gelcoat.
Do a search for carpet glue or cleaning non-skid, lots of info here on this board.