I am very interested in this product, but at the same time I'm sort of confused. If I understand correctly, when performing a traditional wash you still have some dirt left on the surface before you rinse to flush it off. If this is correct, when McKee's37 Auto Wash is allowed to dry on a surface with traces of dirt, aren't you left with a surface where the dirt will not just rinse off because now it's sort of baked on again? I hope I'm wrong, because I really want to try this product!