You won't get any kind of decal to stay in place if your not starting with a clean surface."First, when installing graphics on old plastic you want to remove the old decal and then you need to clean the plastic really well," advises Hayes. "Use a good brake cleaner to clean off any old glue, dirt, squirrels, dog hair, or anything that might be adhering to the plastic. We use Motorex brake cleaner.""New plastic is the toughest. You almost want the plastic to look dull after you've cleaned it. Alcohol will not work; soap will not work. You have to use something that's a solvent, only a good brake cleaner or solvent," insists Hayes.