Well, I suppose it works, but I'll never use it again. I prepped/cleaned the windshield per the instructions, and applied fogfight, and wiped off with a microfibre towel. Where I applied fogfight on the windshield it does reduce the fogging issue, but what you get is larger droplets of water instead, which isn't so much an issue, but on sunny days it leaves a smearing/greasy look on the windshield, like the windshield is dirty. You all know what it is like to look through a dirty windshield into the sun? I would consider this more dangerous for visibility than looking through non-distorted fog. Yes, Car Pro does state this is an effect of using the product. I re-cleaned the windshield and removed it. So going forward I would rather deal with the fogging by blasting the windshield with the cars defogger instead of looking through that mess. Remember people that dirty windshields will fog much more than clean ones, so just clean the inside well before the winter, don't wipe the inside if it fogs, and deal with it for a few km. Anyone want to buy an almost full bottle for half price?