Other: Best anti fog solution

[55 56 PREZ 4D]

What's the best stuff to put on the interior windows to keep fog to a minimum.
I've attempted to redirect airflow out of the vents and that helped somewhat.
Is the Rain-ex anti-fog stuff any good ?

[63 R2 Hawk]

I remember my Dad carried a bottle of glycerin in his '39 Ford to keep the windows from fogging. Never tried the Rainex stuff but their window treatment works pretty good.

[kodiak621]

When I raced karts we would use Rain-ex on the inside of our visors to keep fogging down when we would race in the rain.
It worked well. I think it is worth giving a try.

[BobPalma]

Yep, Rain-X. BP

[Jackson]

Might want to check for a leaking heater core.

[Mike Van Veghten]

Rain-X again.

Mostly on my motorcycle helmet visor AND glass's, but works on car windows too...!

Mike

[Chris Pile]

My trouble with Rain-X is it looks really smeared at nighttime....

[Mike Van Veghten]

Chris -

It should only look smeared at its first "wetting". It should then be pretty clear.
I've found that if you wipe in on in "one direction", then as the instructions state, lightly wipe it (lightly !) after it dries, it's not too bad.
It does only seem to last one or two days though, before needing a redo.

Mike

[jclary]

It has been a while since I used Rain-X but somewhere in the back of my tiny brain is a caution about using it on plastic. Have they changed the formula or offer a product specifically for plastic?

[Chris Pile]

Chris -

It should only look smeared at its first "wetting". It should then be pretty clear.
I've found that if you wipe in on in "one direction", then as the instructions state, lightly wipe it (lightly !) after it dries, it's not too bad.
It does only seem to last one or two days though, before needing a redo.

Mike

Mike - we are talking about the INSIDE of the windows...

[Mike Van Veghten]

So was I...!

Fogging IS the "wetting" I was speaking about...!
Been using the stuff for years.

Mike

[sals54]

I too have had mixed fortune with rain x on the inside of the windshield. When I was driving my coupe as a daily driver, I would keep a squeegee on the passenger seat. Cleared the fog in two seconds.

[Dan Timberlake]

http://www.trails.com/how_30996_anti-fog-glasses.html

Enough hot defroster air to raise the glass temperature is really the best answer.

[64V-K7]

Dan,
You might want to check if the windshield or rear glass gaskets are leaking, causing excess moisture inside. When we had the car on the Route 66 trip, it got deluged in OK and once home found the gaskets were nearly shot. I had worked a bit of silicone sealer under the front and rear gaskets, which did wonders.

[Dwain G.]

When I was a little kid I remember a lot old men had a pouch of Bull Durham (tobacco) in their car. It came in a cloth bag with a draw-string closure. Just wipe the windows without opening the bag. They swore that was the stuff for keeping the fog off.