I think WAYD needs to be sprayed on a wet car...
Sometimes, if the dust is fresh, try driving the car first, if the dust is fine enough and fresh enough, 80% of it will be off your car... leaving 20% to QD...
I always get dust in the morning (i wash at night) and I used to slave myself with morning QD to get rid of the dust, which is a hassle and a pain for my MF...
One morning i got lazy and say dust all over my just re-waxed car, i didn't QD, drove off to work, when i got to my office, i found that most of the dust are gone and what's left for me to QD are light specs of dust...