Pines on either side of the driveway.... Constant problem...
By far the easiest were wipes treated with....good off? I think... But they tended to leave a dull area on the clear...not good..
Then I used a turtle wax brand tar remover, that worked well with a little elbow grease, but it left my hands smelling weird..
The best so far ( no smell, quick and easy dissolving the sap, no noticeable damage) turned out to be the cheapest.
90%isopropyl alcohol ( first aid section of most stores), and a soft cloth. I prefer microfiber.
And yes, the 90% stuff, not the 70%... Why? Because it works better.
Beyond that, don't know, I'm not a scientist...