Someone had a post about 3+ months ago about removing the front curtain and lightly scrubbing it in the bathtub w/Oxiclean and had great results. I did a quick search and couldn't find the post w/my iPad. You might give have better luck..been meaning to do this myself. Maybe 007 or another senior member might chime in with an idea.
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'97 MACA (Shurley)
Mark & Kandi
'97 Newmar 3757 MACA 37' (Shurley)
Ford 460 chassis