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Old 05-17-2013, 08:35 AM   #2
PoorMansCamaro
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Drives: Really Slow
Join Date: Apr 2010
Location: Las Vegas
Posts: 53,839
you clean the existing one. as for when, it depends on the driving conditions. if you live in the desert, probably more often than in a less dusty area. pretty much just have to gauge it yourself. if you have extra time, it doesn't hurt to clean it out.
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