uPVC casement doors barely attract dirt or grime and require minimal cleaning. You can clean these doors with the help of a clean damp cloth and some soapy water or mild detergent solution once every six months. If your home is on a particularly dusty street, clean your casement doors every month. Do not clean these frames with a metallic brush or a ball of steel wool as that may hamper the colour and finish of the frame. http://www.broadfacade.com/casement-door/