I saw one of these cans in a store the other day, was intrigued by how easy they seemed to use, so bought a can to try them out. My Grand Prix had just been washed, so I tried out these wipes on it. It was easy and the car looks great. Next time I wash my Vibe, I'll be using them on it, too. No buffing needed... just wipe it on and let it dry.Does anybody have any idea how long this wax job will last before it needs to be done again?