Well, it's now 3 months later and I have solved the problem. With the passage of sufficient time, the sap seems to have degraded to the point that it now comes off easily with water and elbow grease. The other day, after several days of rainy weather, I gave a little rub to one of the spots with my finger as I was getting in the car. To my surprise, it mostly rubbed right off. I spent about 15 minites rubbing all the spot with a sponge and can now say the problem is 99% gone.
I was thinking I would have to call the insurance company to see if "tree sap" is a covered hazard under my comprehensive coverage.
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