Using any product other than a cleaner wax (such as simple green, 409, etc.) will strip the old wax off completely and make the next generation of black streaks that much harder to get off. If you wash and then wax, that is a 2 step process. A good cleaner wax will remove all of the black streaks and leave a smooth wax shine at the same time.
Steve & Beth - Milton, New York
2006 Monaco Knight 38 PDQ
Ready Brute Elite-2008 Hummer H3