Parking under the trees might result in drops of sap all over your car. Tree sap, just like toxic bird poop, will eat through the layers of paint if left on the vehicle. The sun can make things even worse. It warms up the surface and expends paint allowing for the sap to get in. After the area around sap cools down, it is very hard to remove. The longer it sits, the more it hardens and adheres to the surface. Try to remove sap as soon as possible.
Since not every tree sap is the same, it might require a different method to remove. Pine tree sap is one of the hardest to get rid of. When using one of the methods below, make sure not to damage the paint.