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Hi there - Making plans for the next summer, and whenever spring arrives, I need to do some maintenance on my Trimline tent. Either last year or the year before, I did a show near a lot of high rises (Millennium, in Chicago), and unfortunately, after setting up, window washers were on the building next to me - and dripped filthy water onto my tent and sidewalls! I was hoping that the rest of the summer of rain, etc, would get the gray drippy (gross) stains out, but no such luck. This past summer, I was hoping they'd fade. They are not terrible, but it's obvious that my canopy and sidewalls have seen some action. Don't know what the stains are made of other than disgusting window washing sludge. Any tips on removal? Would rather not have to spend a ton of time scrubbing the walls/canopy, but needs must. Just don't know the best stuff/method to use. Thanks in advance!