rear panels always gets road grime!

[KoolerSL2]

what is the best way to keep road grime frm Sticking to the rear of the car? ( trunk back, under wing, tail lamps, top of rear bumper ect..)
the last time i detailed the car i made sure i clay bared, polished, and waxxed. i i actually applyed 3 coats. and still crap sticks back there and its like concrete, as in i dont even know if a clay bar will get it this time.
and yes i do live off back roads but its 90% paved.
help ideas???

 

[DDTCM]

How often do you wash it? That's the key. If a bird shits on my car mid cruise I will pull over and take care of it. That goes for puddles or sprinklers too.

 

[KoolerSL2]

once a week.
i dont have time during the work week as im working almost 16 hrs a day.