I see these "swiffer" dust attracting cleaning devices on tv, and I wonder if there is something you could do to a car to make it repel fine dust. Perhaps you could put a small charge on the body of the car to make it resist dust (to a certain extent).

I'm sure I'm not the first one to think of this, but I've never heard it discussed. I made a C in Physics III, so I'm not too keen on electricity. Seems to me, if you can make a rag of towel (that is safe) that attracts, you can also do the opposite.