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We have a 2017 Montana 3790RD. We bought brand new. Since the first time out a couple of the Irvine shades had a dab of black oily residue when we pulled them down. I cleaned it, we went on it wont come off! Still to this day my other shades, 80% of them all have a few of these black gooey spots. I cant get it completely off no matter what I use? Any suggestions?
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