I don't think there is any effect of fiberglas in collecting dirt. I have two
fiberglas cars and two steel ones and they all get dusty at about the same
rate when parked. Dust is more noticeable with some colors than others though.
I find that a good coat of wax helps keep a car cleaner. Some of the dust
blows right off and the rest is easier to clean from a slick surface. I use
one of the dusters that automotive stores sell for quickly cleaning light dust
off my cars. it is sort of a hand held dust mop with some chemical on it that
attracts dirt. Depending on the grit of the dirt, there is a possibility of
that creating fine scratches. If you are really picky, a wet chamois is safer,
but more work.
A car cover is another good way to keep dirt off your car.
Scott Isensee
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