I must admit that this will sound like the strangest suggestion ever, but it works like nothing I have ever seen. After you wash you car, don't you always have trouble drying all the little cracks and spaces where the water likes to sit. Then when you drive off the water spots all over your car when the wind blows over it. Well, to fix that, and to maintain a perfect paint job. Break out blower, no not the neighborhood tramp, I am talking about either your lawn leaf blower or even a shop vac. Wash the car, dry it off as best as you can, then use the blower to get the water out from behind the side mirrors, the doors, off the wheels, etc. Then dry off the excess and there will be no spots on your car GUARANTEED!!! If you do this, I promise you that your car will be cleaner than it has ever been. Try it, even if your neighbors laugh, they won't be driving the the sweet car will they.