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The sand/dust/dirt itself won't harm your paint. How you remove the sand/dust/dirt is the real issue. First and foremost, you must flush the contaminants from the paint with copious amounts of water. From there, a very sudsy bath is in order with two buckets so you don't grind the dirt into the paint as you wash it. Never try wiping or dusting it off dry. As claykin indicated, the salt air is much more of a concern. Frequent washes and flushing of all exterior surfaces is the best defense against airborne corrosives.
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