Jan 30, 2026

With summer temperatures heating up, all drivers must know how to defog their car windows quickly. This blog post lists some simple tips to make driving in the heat much more comfortable and convenient! So, whether you’re headed out on a road trip or running errands around town, keep these tips in mind.

How Does Fog Build up on Your Car Windows?

As humidity rises, so does the risk of your car windows fogging up. When warm air hits the cold glass of your car windows, condensation occurs, tiny droplets of water form on your windshield, and voila – you’ve got a foggy windshield! This can happen whether it’s raining outside or not. Fog can also develop on the inside of your car windows, especially if you have just turned on the air conditioning.

Steps for Defogging Car Windows

1. Roll Down the Windows

One of the quickest and easiest ways to defog your car windows is to just roll them down for a while. This will allow the hot air that’s causing the fog to escape quickly. Just be sure to roll up the windows once the fog has dissipated.

2. Turn on the Air Conditioner

Your car’s air conditioner is one of the best ways to defog your windshield fast! Turn on the AC and set it to recirculate so that it’s only blowing air from inside the car. You may have to experiment with different settings to find what works best for you, but this should be a big help.

3. Use a Defogging Product

There are several products on the market explicitly designed for defogging car windows. You can find them at most auto stores and utilize them following the instructions listed on the label.

4. Park Your Vehicle in a Garage

If you have access to a garage, use it! Park your car inside it overnight. This will help keep the humidity level down and prevent fog formation on your windows in the first place.

5. Keep a Clean Windshield

A dirty windshield is more likely to fog-up than a clean one. So, clean your windshield regularly, inside and out, to help prevent fogging. You can use a microfiber cloth to clean the windows from the inside.

6. Remove All Wet Items from the Car

Wet clothes, umbrellas, or other wet items contribute to fog formation on your windows, especially if you crank up the air conditioning. So, remove them from the car as soon as possible to keep the windows clear.

Schedule a service today and say goodbye to foggy windows for good. When you visit Cutter Buick GMC serving Waipahu, HI, our experts will have your car looking and performing it’s best using their superior service. We help improve car visibility and performance, helping you enjoy a safe and smooth drive.