Quick Detailing spray was origionally designed to remove light dust - But as you have read it can be used in the drying process though to help reduce marring/scratches during drying.
If you are using a Microfiber towel to dry the car. Spritz a couple of sprays of the QD on the panle before drying it.
I dont use any sort of towels to dry the 182 at all now when doing a conventional bucket wash, but when I did, I used Sonus Der Wunder or Micropak Ultra Soft Drying towels with Meguiars Last Touch Quick Detailer cut 50/50 with water to make it go further.