Why Every Driver Should Keep a Glass of Salt in the Car

It sounded ridiculous the first time I heard it. A glass of salt in your car? It felt like one of those internet tricks that go viral for no real reason. That changed the day a police officer casually mentioned it to me after pulling me over on a freezing morning. My windshield was fogged, my windows were damp, and I was clearly struggling to see. Instead of lecturing me, he gave me one simple piece of advice that stuck. “Keep a cup of salt in the car,” he said. “It’ll save you more times than you think.”

Salt has a quiet superpower most drivers never consider: it absorbs moisture from the air. Cars trap humidity constantly—wet shoes, breath, rain, snow, temperature changes. That moisture is exactly what causes fogged windows, damp interiors, and that stubborn condensation that refuses to clear no matter how high you blast the heat. A simple open container of salt placed in the car slowly pulls that moisture out of the air. Less moisture means clearer windows, faster defogging, and better visibility without fighting your own breath on cold mornings.

The difference becomes obvious during winter or rainy seasons. Instead of scraping fog from the inside of the windshield or waiting ten minutes for the heater to work, the glass stays noticeably clearer. Side windows stop misting over as quickly. Even that musty smell that sometimes builds up inside cars fades, because moisture is what feeds it. Drivers who try this often notice their car feels drier, warmer, and easier to manage first thing in the morning, especially if it sits outside overnight.

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