Q: Several years ago, I inherited a vintage Le Corbusier L4 Chaise upholstered in ecru canvas. It's exactly like the one on display in MOMA. The trouble is the canvas has gotten quite dingy over the years, making this lovely piece look, frankly, gross. I've considered getting rid of it, but it's an authentic piece so it's probably worth hanging onto if only I could clean it up.I've looked around online and haven't found any advice about how to clean the canvas. Anyone out there have any ideas?