Usually it's a period, not a hyphen, that causes bleeding.

I shave in the shower. So I have, what is supposed to be, a fog-less mirror. This would imply it's a mirror that doesn't get foggy.

Rather than "Fog-less Mirror," the box should read: "Fog. Less Mirror." That's what I wind up with - a lot of fog, which leaves much less mirror to see myself in.

Let the clotting begin.