In my experience it has nothing to do with how hard you drive, only whether the rear of the car is wet or not.
The other day I drove around a chicken manure truck that had dropped a bunch of the sawdust/crap mix on the road and it was amazing how the aerodynamics of the body caused a huge swirl of poodust behind the car, it reminded me of a jet taking off on a carrier. It 'splained a lot of why the rear bumper gets dirty when it is moist.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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