I have a black Marauder with 92,000 miles on it. I had it out the other day and saw that little irritating whitish spot on the trunk where a bird must have crapped on it a few years ago and it was always a little oxidized-looking. So I rubbed a little Ren Wax on it, buffed it out, and it was like new again!

Then I ran around the car, buffing out the little white spots here & there. It's a little expensive to wax your car with, but for touching ups, it's great.