Vinyl and plastic surfaces generate static, which tend to attract dust and grime. In addition salt water leaves a residue on fabric covers and also attracts and holds moisture on the surface. The surface start deteriorate and oxidise in time. Without proper care plastic windows will turn white and start to crack. Replacement can cost thousands of dollars. In order to get the longest possible life-span out of your clears they need to be protected from damaging environmental factors such as UV, salt and wind. Even though PVC is a durable material, it does need frequent cleaning and proper protection. The best way of avoiding damage and restoring the water repelling features of these surfaces is to wash; clean and to protect them at least once a month.