DC - in response to your question about removing sap from vinyl...
Try the following:
1. Meguiars 'Quick Detail'...easy on the vinyl, should break the sap up
2. Use a clay bar with the Quick Detail (should pull off the sap, don't rub so hard that the clay bar fills into the cracks of the vinyl)
3. Mineral spirits + cotton cloth, followed by soap and water
4. if none of those work...try Goof Off > BUT do not rub hard, you can actually screw up the vinyl. Less pressure is better.