remove fogging on the glass of the camera body, lens, filter...etc quickly?
I've encounter a few times especially when i'm changing between in door and out door and the fogging prevented me from shooting.
On outside lens surface and filter very easy.. Just wipe it away lor. Simple lens cloth will do.
Inside your lens is suck thumb and wait already, I can't think of any way to solve this quickly that would not compromise the safety of your lens.
So best is to warm it up before you go out. I've experienced this before during an excellent sunrise and I got so fed up I just took the lens out and left my camera body open for quite some time simply to speed up the natural de-fogging.