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The trick is to pressurize the inside more than the outside. How to is the difficult part.
Just opening a side window creates a venturi effect (?) and that causes a low pressure inside, sucking dust in the back, but if you add a deflector of some sort, you force air inside, thus pressurizing it and dust will not get in the cracks but 'blown' out.
I have read of some reversing the roof vent cover thus creating a "ram air' inlet, some have reversible roof vent fan motors (something I will try next summer) that appear to work. Good luck and let us know what works for you.
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