>> always puzzled me why the encrusted dirt underneath a car is always in ridges. Why doesn't water flung off a rotating wheel inside a wheel arch simply blast all dirt off - why does it stick?
It sticks because very fine mud is sticky. And the pattern inside the wheel arch, quite often with longitudinal grooves, is produced by the tyre tread pattern basically.
Sometimes the underside further back in the middle of the car will start to display sort of crosswise striations in the layers of adhering filth. I assume they are the product of air eddies on muddy roads at habitual cruising speeds.
Proper streaming wet roads are quite rare. We get a lot more muddy half-and-half.
Last edited by: Armel Coussine on Mon 13 Jul 15 at 23:23
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