Firstly, if its bad or flaking its a bumper off, and repaint job. It's the front crash bar, so metal paint is needed - the polystyrene piece that fits in front of it (behind the bumper) is easily taken off. Once painted, it's easy to keep clean when you wash the car by spraying some traffic film remover through, leave for a few minutes, hose off and when dry, spray some Aerospace 303 (or plastic polish/protector of choice) through.