ok, guys I have a 99 A4, and the previous owner parked it under trees and the car has a lot of tree sap marks on it ... I try the clay bar but but it don't look like is not working... help guys I want to get the glass finish look, the paint looks good if I can get those marks off...

 

Well one thing I would suggest is to not use a do-it-yourself car was and try to get them off. You will succeed in removing it but you'll also chip the paint. I did that with my 99 A4 and it sucked, but since it's silver you can't really tell unless you get close, and besides, I doubt anyone will notice chipped paint with the massive hole where my grill used to be and the wonderful little dent over that.