If they can't help you, try some cleaners that are available for boats. Boats that are covered, always have this problem. For the low buck solution, use water and some bleach. Bleach will kill the mildew which is what you want to do. Test it first, to be sure it does not affect color, etc.
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'67 GTO Convertible - a couple extra HP, On the road!
'68 GTO Convertible - in frame off stage
'67 GTO Hdtp, HO 4 speed - next
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