It works, I put it on the bathroom mirror and it didn't fog up, but it left some dirt, like dried salts that you could rub off (as if the mirror was getting cloudy)

Without rain, I turned on the car heater and the windows fogged up a little. In the morning, due to the temperature, I saw them fogged up. I will see how it goes with rain and the heater together. Maybe I should apply a third coat.

very effective in the bathroom especially in winter, it doesn't let the mirror fog up from the steam

I can't say that it helped a lot in preventing the windows from getting too foggy, but it definitely helped in defogging them faster (for at least two to three weeks). Maybe I didn't apply enough quantity (the bottle doesn't specify anything specific). I will try it again and come back with feedback

Reduces condensation/fogging on the windows by at least 50-60%.
In the car, it leaves a slight haze (especially if you apply it with two hands), so it's better to stick to using one hand.
It is effective for use on household windows too!

I tried it on the bathroom mirror and it really does the job. I applied it on the car windows. They require a thorough cleaning before application.

Sometimes it leaves a stain on the glass that doesn't come off on its own. However, I believe that it's a matter of finding the right dosage for the size of the glass each time because whenever I use it correctly, it seems to do what it promises.