Maybe this will work.
http://www.campingworld.com/shopping...r-gallon/21242

I would ask how long the sap was on the clearcoat or gelcoat. You might not be able to remove the spots because they have eaten into the surface. If that's the case then get out the sandpaper and wetsand a test area then buff it out to see if the spot will disappear. Hope it comes out.