Keeping a small container of salt inside a car may sound like an old-fashioned trick, but there is a simple reason behind it: salt can help absorb moisture from the surrounding air. While it is not a replacement for proper ventilation or a car dehumidifier, it may be useful during cold, damp weather.

How the Salt Trick Works

When temperatures drop, moisture can accumulate inside a vehicle. This can lead to foggy windows, damp upholstery, unpleasant odors, and a generally humid interior.

Salt has hygroscopic properties, meaning it can attract and hold some moisture. Placing a small open container of coarse salt inside the car may therefore help reduce a limited amount of excess humidity.

For better results, use a stable, wide container and place it somewhere secure where it cannot tip over.

When It May Be Most Useful

This simple trick can be particularly helpful during rainy or cold periods when moisture tends to build up inside the vehicle. It may also be useful if you frequently get into the car with wet shoes, coats, or umbrellas.

However, it is important to keep expectations realistic. A small glass of salt will not remove large amounts of moisture from a vehicle, especially if there is a leak or persistent condensation problem.

A Few Important Precautions