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so far i've had to replace it once... but it wasnt due to gravel. As i was driving across the US i made the mistake of stopping at a quick wash... little did i know that the brush/sponges had picked up small rocks from previous vehicles and gave my car a wonderfull just roughsanded look to include my front windshield and sunroof. Luckily my comprehensive covered everything but my $200 deductable so i got my clearcoat stripped and then a fresh clear applied. first and last time ill ever use an automatic car wash with brushes on any of my cars.