Sukkah Canvas

Each sukkot, we erect a sukkah, which is supposed to endure the elements for a week.  After many years of faulty construction, including one when my edifice blew away like a box kite, we bought a pre-fab model that has served us flawlessly.  It has a metal frame, designated connectors, a roof that can be reused from one year to the next, and a large piece of light blue canvas that wraps around the frame to create the walls.  Not that hard to put up, even easier to take down.  We have been storing it on our deck, so it is exposed to the elements most times.  The frame does okay, but after a few years the canvas, which measures about 7x30 feet, has gotten grungy with mildew and a few tears.  Time to clean it, but who does that?  I took it to my usual laundry around the corner, very capable Chinese fellow with signs in his shop suggesting that he could clean anything.  He took one look at this, shook his head, could not even give a referral someplace else.

Maybe it goes to a carpet cleaner.  I could try.  A commercial laundry?   I queried the distributor for suggestions but not heard a response.  Maybe buy a new canvas.  Maybe just accept the weathered look as part of the ritual of living in the sukkah for a week.