Putting a glass or container of table salt (or coarse rock salt) inside your car is a clever, time-tested life hack used primarily to combat high humidity and foggy windows.
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Absorbing Excess Moisture: Salt is a natural hygroscopic material, meaning it actively draws moisture out of the surrounding air. In a closed vehicle, humidity gets trapped easily—especially when wet coats, damp shoes, or rainy weather are brought inside.
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Preventing Foggy Windshields: By drastically reducing the ambient moisture level in the cabin, salt helps prevent condensation from forming on the inside of your windows and windshield overnight, saving you time and frustration on cold or humid mornings.
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Neutralizing Odors: Because moisture is a major breeding ground for musty smells and mold, keeping humidity at bay with a moisture absorber helps keep your car smelling fresh.
Alternative Hack: If you worry about an open glass of salt spilling while driving, you can pour salt into an old clean sock, tie the end securely, and tuck it under your seat or near the dashboard.
