I work for a Ford dealership in Central Westchester County which has pine trees on it's property. I was getting a Super Duty for delivery with pine tree sap on the hood. Instead on using reducer for the sap, I used 3M General Purpose Adhesive remover (#38983). I spray some on a shop towel and gently rubbed the sap off. So far I've successful removing the sap off of several vehicles. Hope this tip helps.