Bill Nye the Science Guy wore Superman’s colors and styled his hair with a curl on his forehead for a promotional video for Gillette. His video is one of four that offer theories on how Superman shaves off his beard.
Although Nye’s video is the best of the four, I think that filmmaker Kevin Smith has a better theory about Clark Kent’s hair removal. Nye suggests that Superman could grind away his beard using earthly materials. Smith says that Superman could shave with a piece of the spaceship that carried him to earth. What about the possibility that Jor-El packed a toiletries kit for his son to take on the trip?