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They may have dust build up, construction dust floats around for a while after the building is done.
Mine did that about a year or two after building my house and I cleaned them with some low pressure air, never had another issue (been 3 years now).
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Rick
93 968 (My summer car),
05 Cayenne S (My winter car),
79 924 (Wife's summer car), 02 C230k (Wife's winter car),
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