My problems are exacerbated by not having enough time to wipe moisture off of the car before the vast majority of water merely evaporates. The fast evaporation still turns much of the surface into spots. Subtle spots, but none the less, spots, when Car is parked in sun. Even though the water from the softened house system sheets well from the finish.
I never, ever, wash in the sun, or at midday. I use a waffle weave MF towel which does a quick job of removing water, quickly-but-lightly rushing it over the entire surface of Car. But the MF actually does a better job, using softened water, when the towel has become dampened.
Combined with distilled water, the damp towel actually removes all of the soft water spots. I can not use a "dry towel" in my arid climate for a "final wipe", because finishes dry so quickly. I can use a detail spray, but this just becomes an additional step.
I would rather drive, than dry......