Rubbing alcohol works very well and is CHEAP! I clean my 52 Willys Pick & the 47 CJ 2 A, up with a mixture of rubbing alcohol & bottled water 50-50 in a spray bottle as the local water is very harsh and I am supposed to be saving water. ( I know I am going to hear about my lawn, I have cut back & don't want it to die) I spray small areas at a time and do the entire vehicle that way. For the larger pine sap spots I put straight alcohol on a rag and let it sit on top of the sap for a few minutes before cleaning it off. It works best while cool, like very early morning.
Good Luck,
C. Smith