Rain-X 630046 Interior Glass Anti-Fog, 12 oz. - Prevents Fogging of Interior Glass and Mirrors, Usable on Both Automobiles and Marine Vehicles

Yesterday was the first day of the season where my windshield fogged up as it was raining. I applied this product as directed and then immediately went on a drive. I did not need to defog my windows at all. There is a slight haze when there is a big humidity change between inside the car and outside but you can still see just fine. In the photo you can see the difference where the product was not applied at the bottom of the windshield.

The heater/defroster in my car stopped working and it was almost impossible to get the windows to defog in the morning. I cleaned my windows really well, applied a decent layer of this stuff, let it dry, then used a clean paper towel to buff the film away. Worked like a charm! My windows were crystal clear this morning! Worth every penny.UPDATE: one week later and there seems to be an odd film on my windshield. It didn't show up until about 2 days after using this stuff. My driver and passenger windows do not have the film but my windshield does. I'm going to clean it a few times and try to apply this stuff again to see what happens. Not sure why it worked so well on the other windows but not my windshield! Will post another update after I give it another shot.ANOTHER UPDATE: it's been about 2 months since my last update and I think I've got this stuff figured out! After cleaning my windshield again really well to remove the film, I reapplied this stuff the same way I did originally but buffed twice as much as the first time. They were crystal clear for about a month until it started to wear off! So I just did the same thing and it lasted about another month.So if you clean your windows REALLY well prior to applying this stuff, then buff the film off REALLY well after applying, it should last about a month before it starts to wear off and you slowly notice it fogging. This is the most effort I've ever put into a $5 Amazon product review but I hope it helps someone lol!

I don't find these effective cuz it smears the window of the windshield making unclear visibility.

I've now tried close to a half-dozenl spray products such as this - mainly to try and keep fog off of bathroom shower mirrors. I've now tried 5 different brand names, including this more well-known Rain-X interior anti-fog spray.In each case - again, I happen to be using it in a shower stall setting - the effects of keeping steam/fog away - lasted for only a day or several days at the most. It actually became quite frustrating really. I applied as directed and when I first tried taking a shower, the first day I was screaming "whoopee," because I thought I finally found the solution to constant fog on the mirrors (which I use for shaving in the shower). And the shower mirrors I use (I have a huge walk-in shower) are never even touched by water. However, it was all to no avail, and the Rain-X only lasted only for several days before the fog began coming back with a vengeance. Sure, I tried applying it again - but again, that only lasted a day or two more.Now, from what I understand (and based on some past use with cars), this Rain X works fairly well for keeping fog off of the inside of car windows. But if you're thinking about using it to keep fog/stream off a shower mirror (even those that do not get water on them), just forget about it.As an aside, if you're considering purchasing a separate fog-free shower mirror, rest assured I tried those also. Many of those inexpensive Asian-made fog-free shower mirrors (as they are called) being sold in droves on Amazon and eBay, are nothing more than conventional mirrors with a similar anti-fog solution sprayed on at the factory. The end result on those is that after several days to a week, the solution wears off and the fog begins to form also.So there you have it. These sprays are good for car windows and car mirrors, but if you're looking for a solution that prevents steam/fog in a shower setting - these products won't last for more than a few days. So keep that in mind...Still searching for the right solution for a shower setting that actually works long term.

Surprisingly it worked, however depending on weather it does need reapplication.

Terrible instructions, made it worse than it was before. Lots of streaks that reappear few seconds after you wipe them.For years I’ve been using rainx water repellent for windshield without issues. But this fog spray is bad, really bad.

THANK YOU!!!

Worked WONDERFUL! My heater fan in my van went out that defrosts the front windshield and we were struggling for winter. I couldn't find anything that worked well then thought of this. This saved my time and life for and upcoming 12 hour trip. The windows were defrosted almost instantly once I got on the main road and cracked the windows. It was very easy to apply. I didn't have any issues with it causing streaking which nice that can be frustrating.

fantastic , all great thanks

Funciona bastante bien, lo volvería aComprar

fait la job et cest economique

車のクーラーが壊れて、窓ガラスが曇るので購入。雨が降って湿度が高いものの、11月でそれ程それ程寒くない日で1人で乗車す分には、問題なく効果を発揮しました。もっと寒い日、車の乗車人数が多い場合には、窓を開けたり、乗車前にフロントガラスを十分事前に温めたりする必要があるかもしれないです。

I have used this product and it is highly effective. On a heavy rain I have tested from inside and it was like magic. No fog deposited with windows open on a rainy day. I love this product and will test in my J&K and Leh Ladakh trip on my car. This is a life saver in rainy and winter days. I highly recommend this product. Though the price seems higher compared to other brands but this is gonna last for more than 3 seasons.