Inquiry (采购产品): canvas I have been given your name by Colorado Yurts, which company provided the material kit (canvas) for the yurt I had constructed 2 yrs. ago. I purposely picked canvas over synthetic materials and at first was extremely pleased with its appearance. (I can send you photos) Now, after normal rain and snowfall, the canvas is streaked with black grime that will NOT come off or even lighten. I have tried many products to clean this canvas; nothing works and I am despairing. I made this yurt the centerpiece of my yard & spent a great deal of money to have it integrated into the landscape. PLEASE help me as no one else is either willing or able to do so. Thank you. **** Hidden Message ***** Frances Nowak 01852 Company: F.A.Nowak E-mail: fanowy@aol.com **** Hidden Message ***** fanowy@aol.com