i think your washing temperture is too high (you are washing under a shade, correct?) or you just need to wipe as much water as soon as possible using drying MF waffle weave towels.
you can try products like wax as you dry sprays and with these, you can drag your towel with minimal swirl damage.
personally i wash my dd's whenever i have time (which sometimes mean under the sun) and in order to not get water stains i use Prima Hydro to wipe the car while i wash sections at a time to keep the surface temp as low as possible.
you can get Hydro from amazon
the polymers in there will last a good 3weeks. you can use it over glass, rubber, and plastics too so no need to worry about white marks from typical sealants and waxes.
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