I bought 3 packs, and all 3 are unacceptable, tested on 3 different family cars. They leave a horrible white residue as if you smeared the glass with Nivea. Yes, the glass doesn't fog up as much as before, but you don't want to see it because it's smeared with slime. Completely useless, I threw them away before anyone else could make the same mistake and need to methodically clean the glass afterwards with Azax. I don't even understand why this product is on the market.

The reason I give it 3 stars is because it creates a thicker film on the glass, so if the glass gets foggy and you clean it with your hand or something else, it leaves a fingerprint that, if it's at eye level when you're driving, slightly impairs visibility... then you need a cloth and again to wipe it off... if I buy it again, I will get a sponge