Carry out zero speed landings rather than hovering; obviously dust gets everywhere, as already stated, once your downwash hits it.
But one extra thing I've learned: It's very important to look after your eyes as well as your aircraft, because otherwise you might well lose your concentration, with potentially disastrous consequences!
Turn the cockpit ventilation blower outlets away from your face and turn off the blower fan before you encounter a dust cloud (if you really must do that in the first place).
Then, after you exit the dusty conditions, turn the blower fan on maximum and open the outlets, to clear the system through.
Only later turn the outlets to aim at yourself. Because if you don't, you're likely to get grit blown in your eyes, sunglasses, visor or not and you'll certainly regret that.