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Of all of the GT's that I've fooled with or owned I had one that always had a greasy substance appear on all of the interior side of the glass. If you let it sit long enough it required several cleanings to get it all off. Some cars with new interiors supposedly do this and it's sometimes an indication of a heater core leak. The GT heater box actually has a drain going into the engine compartment so I would think it would help to prevent or at least lessen the problem if it were leaking.
Harold
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