Rain-X630543 Interior Glass Anti-Fog, 12 oz. - Prevents Fogging of Interior Glass and Mirrors, Usable on Both Automobiles and Marine Vehicles (Pack of 2)

Works good. Sprat it on a few paper towels, wipe it on, then wipe it with clean paper towels. It's been raining here for days and haven't seen much fog. Huge difference so far.

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.

We use this anti-fog in our bathroom to prevent steam from fogging up our mirror. It works well on the first application but by the third or fourth day, the fog starts coming back. Not in full force but enough so that I want to re-apply the anti-fog. Thankfully it is quite easy to apply and takes only a few minutes.

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.

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!

This does not work and smells. I honestly thought that I did not do it correctly because it made windows worse, and went back to read directions. I did it right its just a useless product i wish i never bought.