In culinary school they have a funny way of letting you know that the way that you've been doing things for the past 50 years is WRONG. Apparently there's an entire "way" of creating egg wash.
What? You didn't know that? And you call yourselves mothers, cooks, men!
So, the (*cough*) proper way of creating egg wash is by using 2 eggs. after cracking and emptying them into a strainer, you're suppose to whisk them (while still in the strainer) and allow the "egg" to strain into a bowl. And VIOLA you have culinary egg wash.