Please explain what QD is.
I think GreyCruze is telling about QD that is short for quick detailer. Which is used to quickly clean stains like mud, bird drop, tree sap, over wax and etc but its not worth to use daily and/or on whole car body. Also it doesn't contain any type of waxes.
So far I have bought and used two Jopasu car duster. They are good till some extents but should be used on light dust, otherwise it collects plenty of dust and deduces its life.
Both of my car dusters got fully dirty which led me wash them. I have used wash and wax shampoo from Proklear and they work quite well but not as good as new though.
If you don't like to wash then you will have to buy a new one every 6 months. However, Jopasu car duster are not like before now. They have reduced quality, quantity of threads and also increased the price. IMO, It doesn't seems worth now.