My Z has always been stored in the garage. Even in there I always use a sun shade in the windshield and the car is covered the majority of the time. When its in the garage the dash is dry, but looks whitish in areas and dried out. As soon as it hits the hot sun, the dash gets shiny and sticky.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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