I saw on my car what looked to be bird droppings. I am not sure because it was small and it was all black (did not have any white in it like regular bird droppings). When I got home I used Z6 to take it off. THe stuff came off pretty easily. When I was done I noticed a spot on my paint that looked almost like tree sap or tar. I tried to put more Z6 on it and it did not work. Then I tried Goo Gone, and that did not work. Finally I washed the entire car and put more z6 on it and still no luck. I did a search, but could not find any answers. What can I do to get this off? My car is not even two weeks old, so I am very upset.