I have used normal hand sanitizer to remove sap before. Just put a small dot on the sap, agitate with your finger, then wipe off with micro cloth. I usually hit it with a quick detailer after until I do a wax reapply.
I use GooGone. It is a citrus based product. Apply it to the sap, let stand for a few minutes and the sap comes right off. As with any solvent you need to re-apply some wax....