QD products are great for removing fresh bug remains and bird poop. That is mainly what I use my QD for anyway, I'll keep a bottle in the trunk and a couple of MF towels handy for any ocassion when I might need a clean-up (i.e; bug splatter, bird bomb, sprinkler or light rain shower). It is also great at touch-up for those pesky water spots that appear after you have dried your car, you know, when you park it and then water drips out of crevices and dries immediately.
I don't use QD's as a substitue for washing the car, rather as a touch-up tool. If I've got a light dusting on the CLEAN car, and I'm going out and want the it to look awesome, then I'll hit it with some QD and buff (don't rub) to a gloss. You should be OK and avoid swirls if you only use it when your car is freshly cleaned and use the wipe and buff method (that is, don't rub and scrub, just wipe the dust, smudge, bug guts, etc. and then lightly buff).