I'm sure many know this trick/method but I just discovered it this week.
We left our car parked under one of the pine trees in the driveway while on vacation. When we got back I noticed the gobs of sap on the hood and started to clean it. Well after trying 2 types of tar/bug remover and mineral spirits I tried denatured alcohol. The sap had hardened from being out in the heat and nothing would work except for the denatured alcohol. Man, it just came right off when I put it on a cotton ball! I found this tip on a detailing forum.
I put a coat of wax on after washing the hood. The tree will be trimed this weekend.