No, but they will prolong their life Maintenance periodically required depending on the level and type of pollutants, as well as exposure (working environment). Generally a semi-annual cleaning over the surface of the fabric with water and a sponge is all that is required to give many years of life. Of course, frequent maintenance helps to prolong the life and condition of the structure. The stainless steel wire fittings, etc. generally have low maintenance costs.