The blade that moves through the air tends to get an electrostatic charge and if can result in the dust getting attached to the blades a lot more than if there was no charge. The dust that accumulates tends to be very fine particles.
Because the blades push the air around a lot of air will pass over the blades so the can accumulate dust faster rotation then stations for the simple reason there is more air and dust in contact with them when they rotate.
The moment of air can remove stuff but stuff can still be stuck to a surface. There is a reason you need to clean cars even if they move fast through the air.
Passenger jets tend to have windscreen wipers on the two forward-looking windows so you can remove water or anything ells that accumulate on them. If you fly through an insect swarm the will accumulate on the windows and another part of the aircraft.
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