I might get flamed for this... but here is my process for "in-between" washes. Heck, my garage queen rarely gets washed because it never sees rain so it only has light dust.
I use a California duster, ensuring that no weight of the duster actually rests on the paint. I lift it up about 2 inches from the paint surface then let the bristles pick up the dust. Let it be known that NO MARRING or SCRATCHES result from this method. I know some of you will say otherwise, but I've been doing this for years, and my paint does not have duster-induced scratches.
After the dusting, I then hit it with Optimum Detailer or FK425. Tadaaaa... done. I don't like going straight to an MF/QD combo if there is dust on the car. I want to make sure I lifted off all the loose particles before QD'ing.
On the other hand, if the car is REALLY dusty, I proceed to do a full wash. This ends up being maybe 2 to 3 x a summer.
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