I live in an area which has very "unfiltered" water. My problem is if I wash my vehicle, pool rinse it, and then dry with a leaf blower, I get these "spots" where the water has evaporated and left the minerals behind. It also tends to leave a nice film on my glass. The only way I can get these deposits off is to then detail spray the entire vehicle.
The line I wash from is soft water, so I'm guessing it's some other kind of mineral deposit that's hanging around. Does anyone else have really bad water, and if so, how do you handle the minerals?