Tom Riker wrote:
...and what kind of kryptonian razor can shave him clean.
John Byrne explained that 26 years ago in Superman: The Man of Steel
#4. Here are the relevant panels, though unfortunately I couldn't find them in a larger size than this:
I was halfway through Smallville
on DVD when this question occurred to me. I googled and found this explanation, but reflected eye-beams seems way too conveluted IMO.
A little later, I saw Hancock
lather up his face and rake down it with his fingernails to shave, I thought, "That's it!" - a far simpler solution.
But then... how do they do their nails??