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"Thank you, topgun/Bill, for your response. I will try mineral spirits &amp; see what happens. And, yes, you are correct -- it is mildew on this plasticy/vinyl strip. As I mentioned to John Davies, we live in NC where it is quite humid &amp; we currently keep our camper outside &amp; in the open. Someday we will have an inside space for it but I doubt if it will have have heating &amp; air. \n  \n  \n\ngrc \n"
<https://olivertraveltrailers.com/forums/topic/2815-need-help-on-cleaning-exterior-window-039band039-amp/>