Windsjield fogging??

  EScanlon said:

Rain-X for the inside is guaranteed FOG for life. Bluntly---DO NOT USE RAIN-X FOR INTERIOR--- Black Bottle/Packaging.

It is a bad product, I used it on my Acura, and only when the windshield was cracked and was replaced was I able to get rid of it.

You'll have streaks AND fog on sunny days (it's impossible to polish it to fully clear), it doesn't really work to prevent fog on the inside, and it resists Lacquer Thinner, Acetone, M.E.K., Naptha and Mineral Spirits. It will simply NOT clean off --- EVER. You will, in essence, RUIN your windshield.

I'll second that. Tha anti-fog interior stuff is horrible. It is sold in a smaller all black bottle. Avoid the stuff.

The RainX for exteriors is a different matter.