My truck has some crappy window tint from the PO. Specifically, the driver's and passenger window have a film that looks clear when its on the window, but is peeling in some spots and when it peels, it leaves a residue behind(kind of like a paper sticker does when you remove it). How do I go about removing all this? The tint shop wants an extra $150 to do it. Can I do this myself, or am I better off paying the professionals?