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Piros said..
To remove old grip put a towel over the old deck grip and soak in turps and leave it for 4 or 5 hours, it breaks down the glue , if you want to speed it up wrap in black plastic and put in the sun. Just make sure you have no dings the turps can get into the foam. Done it heaps of times is safe it does not afecct epoxy or std resins. You will be left with some glue residue which just rubs off.
+1
... and a word of caution: you can use any "mild" solvent like turps, Solvent F, but never acetone, which is very toxic and can affect resins by dissolving additives and creating micro cracks.