Denatured alcohol and Isopropyl alcohol (rubbing alcohol) are very simular and will both remove tree sap. I happen to use denatured because we use it at work alot for prepping surfaces to be masked off for painting. This is mostly latex (water ) based paints. Ive been a house painter and faux...
Denatured alcohol works great for me. It cleans up tree sap, most grease stains as well as disinfects. I found it pretty safe on just about anything and it evaporates almost instantly. I keep a gallon can of it around the house for lots of different cleaning projects.