Hi All! both my 55 Belair and my 2015 Camaro are black...also I live in an area where the water has a high minerial content, about half the time I wash them they come out looking worse than before I washed them due to white water spots, using a shamie to dry the car,or waxing when dry does zero to remove them,I remembered one time when I bought a new black Silverado out of the show room the salesman telling me they used windex on it to keep it looking good in the showroom,I have been doing that as it works prior to waxing after every wash...I saw a youtube video from a pro detailer who uses Meguiars liquid wheel cleaner diluted with water at a 5:1 ratio and it looked like it worked pretty good, anyone ever heard of this? I wonder which if either is best for the paint? and what do you guys and gals use? Terry