While the iron curtain rod needs big attention since it can be rusted if it is not well treated, therefore some people don’t really use this kind of rod for their bathroom. The steel is good for more elegant bathroom where there are several furniture of the bathroom that also use steel to get the same color so that it will match with the decoration of the bathroom. The materials that people usually use for their L shaped curtain rod is metal, however, you can also use iron or steel. It depends on the overall décor of the bathroom. Metal curtain rod that is finished with white color is good for more minimalist type of bathroom. Architecture.