When installing products on a vehicle, you must use a cleaner before installing the graphic, stripe or molding. Soap and water is not enough and ammonia is a bad idea in this day and age. Use Rapid Prep cleaner before installing, Rapid Tac application fluid to help install stripes and graphics, Rapid Tac 2 application fluid for extreme weather temperatures and glass applications, TFX cleaner is also a good automotive cleaning product. If you already have a car wrap or a truck wrap, Wrap Cleaner is also available here.