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Question: How can I remove tree sap from my car's exterior?

Answer: Remove pine tree pitch with a wax and grease-removing product.
Such products are available at auto supply stores.

Be sure to wash and dry the car before applying the wax and grease
remover. Then dampen a clean cloth with the solvent and rub the
affected area. It may require several attempts if the sap is very
thick or extremely hard. The surface may appear hazy after the solvent
evaporates, but a good wax application will eliminate the haze and
complete the job.

Or, you can try rubbing alcohol, WD-40 lubricant or Skin-So-Soft bath
oil. The way to use those materials is to let them do their work of
dissolving (in the case of alcohol) or softening (in the case of
oils), enough to rub off the remaining sap. If you use the oil, wash
the car afterwards to remove it.