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Our previous TT (Trail-Lite by R-Vision) suffered that on the front storage compartment door. It was determined to be the adhesive used to hold the insulation/building board to the Filon cover. Ours persisted from the get-go until we sold the unit with the only problem being, keeping it clean. Water put it there and water removed it. The only remedy I can suggest is, prevent the intrusion of water to the inside of the door. Bob
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