Cleaning the outside of your white gutters can spruce up the total look of your house.
For houses with white gutters that have oxidized I have an option to brighten them up for you. I would happy to do a test section for you.
For white metal gutters that are oxidized and or covered with mold or mildew I have the products to clean them to a much brighter white. Badly oxidized gutters will be brighter but not always perfect. I am happy to do a test section to see if it meets the customers approval. One sample is pictured below; both before and after. For more detailed pictures click on each one.