That is kind of cool in a weird way. With that said it just would not work for me, I run on a tennis court and between the dust on the surface and tires my car gets filthy after just one pack. At least the black hides the dirt somewhat.
air compressor! ...its part of my after race ritual, I spray all my cars with air. Literally takes all the debris, road grime and dust off in a matter of a minute or so. Agree about white though, ..unless I was running on carpet that chassis would get deep scuff marks all over it and they'd be really noticeable.