I had the same problem. I couldn't dry the car fast enough to prevent the spots from forming- even with help.
Check out this thread: http://www.m3post.com/forums/showthread.php?t=428652
It's expensive but worth every penny to me since it works so well on my Jet Black E92. The water is horrible here in Indy. I only use it for the final rinse process. I just keep the car wet while washing and connect this device to "sheet" the wash water off the car at the end. I then use a leafblower with excellent results. A drying towel never touches the car. Still on my original resins and I've used it at least 30 times.
Aside: There are some real experts who regularly post in this section who helped me overcome my detailing fears. Eclipsis, Hawk, Eric and many others. Search around.