Have you considered using treated water? I purchased an RO system for my business and it has eliminated the drying step altogether. I took the ppm of my city water from about 460 ppm to 5 ppm, thus I get zero spotting after it air dries. In addition, after washing the vehicle I go directly on to working on the interior giving the outside plently of time to dry. The reason I purchased the system was the water spots I was experiencing when washing cars in hot weather. The car would be mostly dry before I was even done washing. Now, it doesn't matter how fast it dries, no spots are left behind and I feel it gives a higher quality wash with less chances of inducing any marring than by hand drying the vehicle.
To hand wash a car in average condition and clean and dress the engine, it typically takes me about 20-25 minutes tops by myself. Obviously if the wheels have heavy brake dust caked on them it will take a bit longer. Here is the system I use:
I use a two bucket system, one for the wheels and the other for the rest of the car.
1. Degrease Engine with car turned off, let dwell for just a minute
2. Start vehicle, then power wash the underside of hood and engine clean (continue to leave vehicle running until the entire wash is finished. This will help to dry everything out, allow the dressing to dry evenly, and reduce the chance of problems that could arise when pw an engine.)
3. Dress Engine with HyperDressing diluted 3:1, and close hood
4. Next, onto the wheels. For wheels in average condition, I'll spray Simple Green Extreme diluted 4:1 on the wheels, tires and wheel wells. Scrub with long handled wash brush designated for wheels and tires only, then pw clean.
For wheels in bad condition, I'll first powerwash off to get what I can and to prime the wheels, next, apply Meg's Wheel Brightner to wheels and the SG to tires and wells, scrub wheels and tires in the same fashion above, then pw clean. Apply the Wheel Brightner a second time if necessary, rinse, then apply a APC to the wheels to neutralize the acid, let dwell a moment, then pw clean.
5. Rinse entire vehicle
6. Time to move on to washing the rest of the vehicle. Just like I learned as a kid, I wash top to bottom. I wash all the surfaces facing the sky with a Microfiber covered sponge, and the windshield with a bug sponge, then rinse.
7. Wash the front end with a bug sponge, and and everything above the "dirt line" on one side of the vehicle with MF sponge, then go back with a different mitt(I prefer to use the netted side of a mitt) to clean everything below the dirt line. Rinse
8. Move to the back of vehicle, wash, then wash the other side of vehicle using same method described above. Rinse.
9. Turn off engine
10. PW any rubber floor mats
11. Done! No drying...I just move onto the interior of the vehicle
I'm not saying there isn't a better way of cleaning, this is just the system that I've found to be most efficient and produce the best results. Hope this helps.
Matt Williams
Silver Lining Detail