I wouldn't buy this again. I'd rather just warm up the engine for another minute or so and let the fan do it's job. I tried it straight up, mixed at the recommended ratio, and neither worked for me.

Product works great. I put on windshield first and left side windows alone to compare and the windshield didn't fog up at all, but the side windows did. I emailed the company and asked if it was ok to use on tinted windows since it doesn't say on DI but they said it was perfectly safe.

have bought dozens of item and this is the first and only bust. by 2nd day was totally ineffective. guess i will wait for next new window clearer

My inside driver side window has been partially fogging up every fall & winter since I bought it in 2001. I put it on yesterday to winterize my car and wow did it work great. Not a hint of fogging. I tried off the shelf stuff befoe and it was weak. Thanyou Detailed Image.