It's impossible for me to wash my Mach in the shade. And the sun does dry out the water drops fairly quick, but the remedy I found was that I go around the whole car and wipe up all the big water drops with the microfiber towel. Then I wring it out, and go over any areas of water that did'nt get soaked up the first time around. Wring it out. Now your car will be 99% dry, and your microfiber towel will still be fairly moist. I go around the entire car again wiping over the whole car. Any single water spots you missed will be soaked up and any water spots will be cleaned up from the moisture of the towel going over it. The sun will dry the moisture of the towel on your paint in seconds. After you've gone over the entire car with the still moist towel, your car will be completely spotless. It works like a charm for me. And people walking by are doing this: