Use Baby oil and rub it until gone. I wouldn't use any chemicals as they can strip your clear coat/wax or paint right off. You could also try some ice and chip it off very carefully with a blade. I use the baby oil myself.
Rubbing alcohol and a q-tip. wet the q-tip with rubbing alcohol and rub the sap until it lifts off. follow up with by waxing the car with your favorite wax.
Do not use fingernail polish. It will strip the paint.
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