I'll chime in again as someone who runs a detail business and have personally detailed 100's of vehicles, my experience has been that anyone who regularly uses a car duster of any sort(wether they tell me so or I find one in their trunk) induces light to moderate swirls and scratches in their paint(clearly apparent in direct sunlight or proper detailing light). I've yet to see an exception. A car duster is collecting dust after each use and if not thoroughly cleaned before the next use . . you're literally just wiping down your car(even if lightly) with the previously collected dust/debris and abrading the clearcoat. Not to mention a duster is usually stored in a trunk or un-tidy garage where it's left to collect more dirt/debris.
Now . . . to each their own. If you're really careful and some light swirls don't bother you . . all is well and good. It's your car and if you're happy with it's appearance that's all that matters.
For most of my clients(most of whom I have ceramic coated said vehicle) who previously use car dusters I always suggest getting a dedicated leaf blower to blow off light dust in a touchless manner.
Second suggestion is a waterless wash product that provides lubrication and is only done with clean microfiber towels.
Regardless, I wish you success in enjoying your beautiful Bimmers!
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