Miracle Polish
Early one morning, a week or so later, I stepped over to the oval mirror in the upstairs hall, as I did every morning before leaving for work...
Steven Millhauser's narrator uses Miracle Polish on a smudged mirror. When he lifts his hand, the spot is gone—but the rest of the mirror looks dull. He sets to work on the entire surface. Done quickly. But now he notices something else. The face in the mirror seems younger than his own.