The weblon or other vinyl materials are slightly easier to keep clean than the oyster color Sumbrella. The materials hold up well, but will discolor in time. Go for the 40 guage clear vinyl or "stratoglass"--it will last much longer. Also the material in sheets has less distortion than rolls. If you really want tough, you can get Lexan clear panels--these are less flexiable and have to be put in sheaths or brought directly back rather than rolled up to let air in. Bob Austin