How to Use a Potato to Keep Your Car Windows Fog Free

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Fog buildup occurs on your car windows the same way it does on the glass of a cold beverage. The different extremes in temperature, whether it exists on the inside or outside, cause moisture to condense on the coldest surface - in this case, on your car windows. If the humidity level inside the car is high and it is cold outside, window fog will build up on the inside, but if humidity is high outside and there is a temperature extreme occurring on opposing sides of the windows, moisture will condense on the outside of the glass. It is important to determine where fog is coming from to prevent fog from building up on your windows.

Having fog on your windows while you’re driving is a nuisance. Fog reduces your visibility and makes driving difficult, potentially putting you or other drivers in a dangerous situation on the road. The best thing to do when fog starts to form is to use your defogger button on your dash to get rid of it quickly, because when fog builds up too much it takes a long time for the defogger to remove it.

But there is one cool inexpensive trick that prevents any window in your car from fogging up. If you have a potato and knife to cut it in half, you’re already well on your way to keeping fog off your car windows.

Method 1 of 1: Use a potato to keep fog from forming on your car windows

Materials Needed

  • Knife
  • Microfiber cloth
  • Potato
  • Window cleaner

person wiping window with cloth

Step 1: Clean your car windows. If you’re using this method to prevent fog from forming on both the inside and outside surfaces of your windows (and you definitely can use it for both sides), thoroughly clean and dry the surfaces of all your car windows with window cleaner and a microfiber cloth.

  • Tip: There are many applications here - you don’t have to stop with your car. Wipe your house windows, the bathroom mirrors, a glass shower door, and even safety goggles, swimming goggles, or other sports goggles with the potato to keep them from fogging up, too.

person slicing potato in half

Step 2: Cut a potato in half. Be careful while you’re doing it so you don’t cut yourself.

  • Tip: This is a good way to use potatoes that are turning green and starting to turn, rather than throwing them away. You can compost them afterwards.

person wiping window with potato

Step 2: Wipe the potato on the window. Use the freshly cut side of the potato and wipe it back and forth on the window until the entire surface has been covered.

There should not be any starch streaks left behind. If there are streaks, wipe them off thoroughly and try again, moving the potato across the glass faster.

  • Tip: If you notice dirt building up on the potato as you wipe the windows, cut off the dirty part and continue wiping the rest of the windows.

Step 4: Wait for the window to dry. After you’re done wiping all windows with the potato, wait for the moisture to dry for about five minutes and don’t touch the window in between to test it. Make sure there are no starch streaks left behind that can impair your visibility on the road.

After you’ve finished using the potato, you can add it to your compost. If you applied these steps because your windshield fogs up more frequently than you think it should, be sure to have a certified mechanic, such as one from YourMechanic, inspect your windshield to find out what’s causing this problem. Driving with a foggy windshield is at best distracting and can be dangerous.


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James

29 years of experience
481 reviews
James
29 years of experience
Lexus RX350 - Windshield fogs up - Orange, California
Came out on time, he had the same part windshield washer (pump) that the first mechanic brought (made in China) so it did not work either. OEM part coming next. Hope it works, this has not been an easy fix.

Rodney

34 years of experience
386 reviews
Rodney
34 years of experience
Ford Taurus - Windshield fogs up - Elk Grove, California
Rodney diagnosed the problem quickly, provided a quote immediately, and scheduled the repair this week. I appreciate Rodney's professionalism and expertise. I trust him and that is important to me. Thank you Rodney.

Torrieanto

10 years of experience
473 reviews
Torrieanto
10 years of experience
Audi A3 - Engine hesitates during acceleration - Valrico, Florida
Mr. Ward was very professional. He arrived on time and immediately worked to diagnose the problem. Identified what was on the code readouts but recommended that I first add fuel and drive to see if the issue was due to the car sitting for 4 months. He wanted me to make sure before I spent any money. He was right! After I added fuel and drive for a while the car was running very smoothly. Thank you, thank you, thank you! I will definitely call for my next issue.

Sam

13 years of experience
122 reviews
Sam
13 years of experience
Geo Prizm - Car is not starting - Edmond, Oklahoma
Great first impression! Mr Sam helped me figure out why my car was not starting and also explained to me that there are other issues with my vehicle. He gave me reasonable explanations and I really value his recommendations. I really appreciate all the help he has provided.

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