Both the Starbrite and the MaryKate black streak remover perform poorly but they are great for removing dried blood and cleaning fishboxesThey are my best friends and since he is tied up with his business and unable to do it, I did it for him. If you can't help your friends when they need it that should say something about your concept of friendship.
Chris I tried the black streak remover (diesel exhaust) and that one didn't work very well.