Salt isn’t just for cooking or melting ice — it’s also a surprisingly effective solution for one of the most common car problems: excess moisture. Mechanics have shared a simple trick that costs almost nothing and works instantly — just place a small glass or cup of salt inside your vehicle.

The science behind it is simple. Salt is hygroscopic, which means it naturally absorbs moisture from the air. In a closed environment like your car, this helps reduce humidity levels, prevent foggy windows, and keep seats and carpets from feeling damp. It’s an easy, low-cost way to keep your interior dry, especially during colder or rainy months.

There’s also a bonus: salt helps eliminate odors. Dampness in a car often leads to bacteria and mildew, which are the real culprits behind that musty smell. While air fresheners only cover the scent, salt removes the underlying moisture — stopping the problem at its source.

So, before you reach for expensive sprays or dehumidifiers, try this simple trick. A small cup of salt can make your car feel fresher, clearer, and cleaner — proving that sometimes, the best fixes really are the simplest.