Don'ts Don't neplect bird droppings or chemical spills can cause permanent staining or etching on the film. These are not covered under warranty. Don't spil gasoline. Film may cause damage if the surface has resisted previous spils. One incident can be enough to stain or degrade the film Don't leave the car dirty and exposed to strong sunlight for extended periods can cause the PPF to discolor,crack. or "bake" onto the surface Don't use high-pressure washers too close to the PPF or harsh chemicals that can degrade the film. Don't use rough cloths, abrasive sponges or brushes that can scratch the film surface.