Put a Glass of Salt in Your Car, Here Is Why Every Driver Should Try It

The answer depends on what problem you’re trying to solve. Salt can absorb some moisture under certain conditions, but a simple glass of table salt is not a particularly effective solution for a damp car—and there are a few precautions to keep in mind.

Why do people put salt in their cars?

1. To help absorb moisture

Salt can attract moisture under suitable conditions. However, ordinary table salt has limited drying capacity, so it won’t significantly dehumidify an entire car.

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2. To reduce window fogging

Less moisture in the cabin can help reduce condensation, but a glass of salt is not a reliable way to prevent foggy windows. Your car’s defroster and air conditioning are much more effective.

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3. To help with damp smells

If excess moisture contributes to a musty smell, reducing that moisture may help. Salt won’t remove odors at their source, though; wet carpets, spills, mold, or leaks need proper attention.

How to try the salt trick safely

If you want to experiment with it:

1. Put a small amount of dry salt in a sturdy, wide container.

2. Keep the container secured so it cannot tip over or become a hazard during sudden braking.

3. Leave it in the parked car and check it regularly.

4. Remove it if the salt becomes wet, forms liquid, or starts leaking.

Important: Saltwater can damage metal and interior surfaces. Never leave an unsecured glass on the dashboard or anywhere it could interfere with driving.

What works better than salt?

For a car with foggy windows or excess moisture, these steps are more useful:

• Use the defroster and A/C. The air conditioning helps remove moisture from cabin air, even when you’re using warm air to clear the windshield.

• Switch off air recirculation when appropriate and use fresh outside air.

• Dry wet floor mats and upholstery instead of trying to absorb moisture from the air alone.

• Check for leaks if the windows keep fogging or the interior smells persistently damp.

These methods are consistent with the advice from Consumer Reports and automotive guidance from Shell.

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The final verdict

Putting a glass of salt in your car is a low-cost household experiment, not a must-do driving hack. Salt can interact with moisture, but there is little reason to expect a glass of ordinary salt to make a major difference to your car’s humidity or window fogging.

If you want a more effective passive solution, choose a purpose-made, reusable car dehumidifier or moisture absorber—and always keep your windshield clear before driving.