Originally Posted by JamesNoBrakes

Actually, I'd say that it is next to impossible to brush frost off, because that's the nature of frost, it's adhering. It's not dry snow on a cold plane that can be swept off or wet slush on a warm plane (assuming no adhering ice) that will just slough off. Even when you try to brush the frost off, it's still there, just less of it. On a microscopic scale, it's little crystals of ice that are attached to the plane. This is where that whole "polish the frost" thing came from...