How many different absorbers are you using on the 400 cars? How do you know the waterspots were not there before you fired up the pressure washer? How many days passed since they were last done? I've seen some lots on bi-weekly schedule. Imo the problem is the process. 400 cars on different lots, seems you are rushing the job. Not allowing the rinse to sheet the dust and the fallout off the cars. I say this because of the streaking issue. The absorber is probably contaminated. As far as the spray wax, there is not usually enough $$$ built into the contract to justify this expense. Now as far as the waterspotting, you're probably rinsing too many cars at once before you hit them with the absorber, allowing water to dry on the vehicles. I watched a guy back in my driving days do 30 cars in less than two hours. He picked 3 cars in a line , door to door as on most lots, rinsed the middle one first,then the one on the right, and lastly the one on the left. He then would dry the right, followed by the middle. Thusly having the one lastly rinsed, dried last. This way by the time he got to the last of the 3, it would be the one that was most wet. That was his process. He made $3 per car and said that he usually cleared about a benjamin a day before he called it quits. Happy trails..
