Why they must kept their car clean
all the time?

Because: the car is often an individual's most prized possession, and many feel
the car--the model, the accessories, the shinyness level--reflects
profoundly on the individual who drives it. They are
hoping, anyway, that it does.

Also, the serial car-washers have no sense that water is a scarce resource,
even while living in a desert.

In short, the frequency of car-washing episodes could
be just another symptom of an underlying stupidity that has swept across the
continent like a chinook wind through our amber waves of grain.
An ultra-clean bicycle, on the other hand, is a sign
of darker prospects: mental illness, crystal
meth addiction, or non-use of said bicycle.

Robert