For a a long while I have used Lemon Pledge to keep the frame shinning. I have noticed that the frame looked dull as if there was a cloudy film on the black paint. I tried my black auto wax with no joy. I asked around and came up with a few suggestions. I went to my local auto parts store and ran into my bike mechanic and he said he uses "Black Detailer" by Turtle Wax on all the black frames he sells. I decided I would give it a try. It took no time to get my frame looking like new. It took a total of 10 minutes. So if you have a dull black frame this is the way to go.