Try Goof Off. I have used it with good success in many paint clean ups. Spray some on and let it work in. Cover it with saran wrap to keep it moist then work it off with a plastic putty knife after it soaks up a while. I figured out the plastic wrap thing when I was using it on DIF gel that I was spraying on walls to remove old wallpaper paste. It gave it time to work in and didn't dry up before I could get it scraped off.
You can also try rubbing alcohol. Goof off isn't as noxious though, and seems pretty safe on the wood.