The door mirror surrounds were very faded - almost white - on my new purchase. Not a good look on a black car!. Had an old bottle of Simoniz "Back to Black" in the garage so thought I would give it a go. Using a cloth and then cotton buds to get behind the mirror glass, they have come up looking brand new with a nice satin finish. Don't know if you can even still get this stuff (mine must have been about 25 years old!) but highly recommended.