If you look at what the manufacturers say, you basically have to come in and let the lens dry out. Never rub it when its wet (inside, not outside) -- very important! They tell you alot NOT to do, but are vague on anything that you CAN do, other than go inside and gently air dry it out.
But, is this practical? It seems to me not to be practical. I'm not going to stop skiing and go in for a half hour every time my goggles fog up.
So, i just wondered about what people actually do, in the real world, while actually skiing, if your goggle fogs up. I'm talking about fogs up real bad, like you can't see much out of it. Carrying multiple goggles or multiple replacement lenses seems like one possibility. Do people do that? Something else?