a little different scenario of course
but at the company where my wife works
they had some sort of clean up action or
construction going on...
and every car there came home like it
had been sprayed with a muddy dirt.
if not for the rain washing some of it off
it was ridiculous... and inexcusable
but
on the windshield ........ i had applied a double
coating of
RAINX ............
i love that stuff...
and none of the dirt/mud & crud could stay put
and it dusted off like ....it was floating on air...
the other good thing about it is
one bottle has lasted many years.