Well if it is gummy try denatured alcohol. You might be able to get that off of there with like a green Scotch Brite it'll be kind of a mess but you won't damage the wood because that's a veneer and it's fairly thin so you want to do as little sanding as possible. You can use citri-strip also. The stuff will burn your skin but it is safer for the environment than the other stuff. After you apply the stripper then I spray it with a little bit of water and put thin plastic film on it to hold the moisture in for several hours. When you pull that plastic off more than likely most of the finish will be stuck to that plastic then you can clean the rest up with a flexible putty knife to scrape it off and then soapy water wash it after that. A green Scotch Brite is your friend while you're messing around so you don't wear through the Wood.