Cleaning polytunnel plastic is important for the health of plants and will also help extend the life of your polytunnel cover. First tunnels recommend cleaning polytunnel covers with Algon organic and controlling condensation with Sun Clear. Both of these products are safe and non-toxic and can be used around food crops. Over time, dirt will build up, reducing the sunlight that gets through the polytunnel cover. If you are wondering how to clean a polytunnel, the answer is simple. Simply spray Algon organic on to the plastic with a pressure sprayer and leave this polytunnel disinfectant to continue to do its work. Treating internally every two to five years with Sun Clear will help prevent condensation build up and will keep the sun shining in.