If the sap is "pulling" the clear off, you may have other problems to worry about. There is no way that clear coat should be pulled off like that. I agree, you need to get it off asap. I have had luck with citrus cleaners, goo b gone and wax and grease remover. Accordinding to the link below, mineral spirits and beleive it or not they claim lard and mayonnaise will work. I guess you could have lunch while you're at it!
http://www.wisegeek.com/how-can-i-remove-sap-from-my-car.htm