I bet the wood has a coating or top sheet as u put it and your not dealing directly with exposed wood. Anyhow just get an edge and peel it off. You can use a razor blade or knife to carefully get an edge, then peel it err on the side of cutting into the pad not the board. Then it will inevitably leave sticky stuff on there. You can use wd-40 and a old towel(rag etc) to safely get it off with some friction. You can reapply wd 40 until its gone. It won't screw up the top sheet like a solvent could. Then u can use mild soap and water to get the wd40 off.
i have a stomp pad on my board in the WORST spot.. directly over the graphic in the CENTER of the board (for no reason!- i bought thr board used and it was on there) and I want it off in the worst way, but even with a hairdrier I couldnt get the fucking thing off :-/
Never Summer Evo 153/Restricted ReFlex Cartel
Gnu Danny Kass 156 BTX
i would do it like i would remove adhesives or badges off of a vehicle. soak some wd-40 behind it overnight and use fishing line to get behind it and cut the adhesive or a rasor blade and use something like alchohol or a 3m eraser wheel to get the rest of the residue off. or wd-40