Dirty Dashboard Glass
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Keep in mind that the clear lens over the gauges is not glass - it's polycarbonate. I've seen some where different spray cleaners used to detail the interior will actually etch the polycarbonate and so no matter what you try to clean it with, it can give you the impression that it's dirty on the inside. If you cant tell, try getting some motorcycle helmet faceshield polish from a cycle shop and polish the areas in question. If it's etched from a cleaner this MIGHT help, but YRMV.
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