You know, I've been thinking about this morning dew problem, but haven't done much about it because I never have time in the morning to do anything about it.
I would not just wipe it off with a towel or ww. That dew has got to be dirty and dusty....
The problem is lubrication. Something you can get from QD and car washes (both of which also emulsify dirt). If someone is feeling adventurous, they could try spraying their car with an even mist of QD or a slightly stronger QEW solution and then wiping it down. I bet that would allow you to safely wipe down the car (assuming it was clean the night before of course), but this is all just arm-waving theory until someone tries it and proves it "safe" though.