I am not a dude so I don't know how much weight my opinion carries, but I feel like face area should be washed by face soap. And other hair is washed by soap (you don't shampoo your eyebrows or your armpits, after all). But if you have a beard, it can be as long as the hair on your head or even longer. So I see where the conundrum comes from. I am going to stick with "whatever you wash the rest of your face with" unless your beard hair is over an inch in length.