What is this clear sticky substance that is raining off my tulip tree onto my car? I just moved into this house that included a large tulip tree in the front yard. It is a beautiful tree but the "sap" that seems to rain off of the tree is unbearable! My car is covered in it to the point where my doors were stuck shut. If I were to trim the branches that cover my driveway I would have to cut half of the tree off. Does it stop dripping this stuff at some point? PLEASE HELP!!!