There really are only two solutions to fogging that I know about.
First solution is to keep the temperature on both sides of the window equal to avoid condensation. That usually means lots of open windows for ventilation which may not always be possible due to temp, wind, rain, etc.
Second solution is to modify the surface tension on the inside of the window which is where the "fog" usually will be. Fog is really a lot of minute water drops clustered together which refract light in such a way that it looks fogged. By adjusting the surface tension the water drops lie flat and form a thin sheet of water across the entire glass surface instead. Note the water is still there and hasn't been removed. We are just able to look through it so we don't think it is there.
SCUBA divers have this same problem with their masks all the time and one of the best and least expensive solutions known is baby shampoo. Mix some baby shampoo 50:50 with plain water and apply it to the window. Rub it in good and cover the entire surface. Then leave it on, don't wipe it off. Let the solution dry in place and it should be good for at least several nights of camping. When you are ready to pull up stakes take a wet rag and give all the windows a quick wipe down and the windows will be sparkling clean for your drive home.
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Topic: Steamy windows
