This robust door material hardly needs any maintenance. Simply use a damp cloth for cleaning the surface. Particularly persistent grime may require some simple cleaning products such as dish soap or glass cleaner for glazed surfaces. If your door is made of anodized metal, make sure to only use special care products designed for use on anodized surfaces. Most importantly: Never try to scratch off dirt using your fingernails or abrasive cleaning utensils like steel wool. These could potentially damage the coating of your French door, making it susceptible to rust.