Keep Car Windows Fog Free Using a Potato

This simple method will help keep your windows fog-free. It's a fun one for the kids to try too; they might even consider doing it before you reach the car!


  1. Cut a raw potato in half. Be sure to use a clean potato, so wash it first if it is coated in soil. This is a good opportunity to use up an old potato that has started to sprout and is past its best.
    • You can also use up the potatoes going green.
  2. Rub the cut side of one half potato on the window. Wipe from side to side to cover all of the window. This will clean it and leave a layer that will prevent condensation from forming on the window.
    • If you notice starch streaks forming, wipe them off. You may need to wipe more quickly to avoid leaving any streaks.
    • You can also cut off dirtied slices or parts of the potato half and continue with the clean part.
  3. Use the other half of the potato if needed. If you're doing all of the windows, you'll probably need to use up both potato halves.
  4. Leave to dry without touching. The potato juice should dry clear and the windows will remain fog-free, as the starch in the potato acts as a barrier between the glass and the air.
    • While the potato film is drying, don't touch it or you'll leave fingerprints dirtying the window.
    • Throw the used potato into the compost.


  • This method can also be used to keep ski goggles from fogging up. Rub raw potato over the goggles when changing into your ski gear. Sure, you'll need to remember to cut a potato in half and pop it into a plastic bag before going to the ski field, but the clear vision will make it a worthwhile effort.
  • Do this first thing in the morning for best results.
  • It may be a good idea to clean the windows first. If they're dirty, the potato will pick up the dirt and can leave a sticky film due to the grime. If washing first, ensure that the window is perfectly dry before using the potato trick.
  • Also works on shower glass, indoor windows, bathroom mirrors, all sorts of goggles, etc.
  • This may also work temporarily as a way to keep the window rain-free if used on the outside. However, heavy rain will wash it off.


  • If you rub too much, it might impair visibility, just as fog would.
  • Potatoes may be sticky and attract bugs.
  • A constantly fogging windshield is a sign that you need to get the car seen to, as something may be wrong with the car.

Things You'll Need

  • Raw potato
  • Knife

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