How do you get rid of windshield fog?

I have to turn on my airconditioner and use the windshield vent to get rid of fog. It’s really quick if I have turned it on high, within seconds.

You have a windshield defogger in your car, don’t you. Most cars automatically use the compressor when you turn it on, but some don’t. Be sure your defogger is using air conditioned air to control moisture on the inside of your windshield. I don’t know why you have a problem with this. Are you talking about moisture on the outside of your windshield? If so, there is no remedy other than the windshield wipers.

The defrost setting on your car’s heating system should be on the far right or fully cranked to the right if it’s a dial selector. Turn the heat to the warmest setting, fan on high. There are also a couple of sprays that you can buy that help with this. Look in the auto section at Walmart or an auto parts store. They put down a film that repels the condensation.

Use the Windshield Defrost setting in your A/C control panel with the temperature set to HOT. As mentioned above, A/C compressor must be turned on. Set blower speed to High and cracking the window open a few inches will help the moisture desipate out of the cabin quicker.

Tennessee has the same problem. here is the best solution i use: find an old bath towel and keep it handy inside your vehicle. fold the towel three times and wipe the excess moisture off the outside windows of your car. next, start the engine and turn on the AC. then, up the thermostat to high. switch the vents to defrost and within two minutes you should be on your way.

@john65pennington You guys run the A/C all the time?

Make sure you are NOT using the recirculate position on the control. This just traps moisture inside the car.

Run the AC only until the frost is off the inside of the cars windshield. you may have to rerun the AC a time or two, until the heat permanently evaporates the frost on the inside.

A chamois cloth works pretty well at defogging the inside of a windshield. If the problem is the outsides of the windows, I keep a small squeegee in the car to clear what I can’t get with the wipers. You can try Rain-X, but it tends to reduce visibility if you drive at night.

you could try this stuff even though I think it’s only for goggles

@Jeremycw1 I use a similar product on my old Mercedes, which has a dealer installed A/C unit that doesn’t feed dried air to the defroster. The stuff works great, but you have to buff it in very carefully to avoid streaks.

I suggest you do the same as divers do to prevent their masks from fogging. Spit on it. Spit on your windshield and rub it all around. If you don’t have enough spit, get your passengers to join you. If that’s not enough, you might enlist passerbys to contribute. It would be a great prelude to a night on the town and you might meet new, interesting people. Be careful not to get any on your dress.~~

Or you could go down to the auto parts store and buy a bottle of Rain-X, one application of which lasts about 90 days—89 days longer than most spit. Or, if you don’t have AC, you could turn on the heat, because the fogging is due to the temperature differential between the inside and outside of the surface of the windshield. Or you could just stop breathing.

Here’s a product you might want to buy. We just keep a cloth in our car and wipe it off.

I fond that my car is especially humid much of the time thanks to a leaky sunroof letting water in to soak into the cloth.

The key is air circulation. The temperature of the air matters little, and I’ve managed to dry the fog from my windows even in the rain by just turning the defroster of full blast and cracking the windows. If you leave the windows shut then you are just recirculating humid air; you must have the windows at least cracked about ½-inch.

A/C works sometimes, but most of my cars lacked it, and half the time that I used it, I wound up with frost instead of clear glass. Hot air sometimes also causes similar issues, but most of the time I need to defog, the engine is cold and therefore I don’t have heat anyways. Now, the old Toyota 4A-LC engine runs cold, so if I relied on the heat, I’d have to drive hard for at least 5 miles on the interstate and never drop below 60MPH except on steep hills. The reason I mention that is that if clearing your window required hot air, then I would never have clear windows without wiping them down. I do though, so therefore heat is not required.

A drop or 2 of liquid soap on a soft cloth will help. Baby shampoo works good. You need to reapply the soap about every day as the moisture will wash it away, but it will work. It also works on bath mirrors.