If you mean the viral “put a glass of salt in your car” hack, there is a small amount of truth behind it—but it’s often exaggerated.
🧂 What happens if you put a glass of salt in your car?
Salt can absorb some moisture from the surrounding air. In a humid car, this may slightly reduce condensation, particularly on surfaces near the container.
However, a glass of ordinary table salt is not a powerful car dehumidifier. It won’t reliably prevent foggy windows, remove significant moisture, or fix a damp interior.
🚗 A better way to reduce moisture
Use the car’s air conditioning, even in cool weather, with the defroster.
Make sure wet floor mats and carpets are dried.
Check for water leaks around doors, windows, the trunk, and windshield.
Use a commercial moisture absorber designed for vehicles if the interior stays damp.
Keep the cabin reasonably ventilated when appropriate.
⚠️ One thing to avoid
Don’t leave loose salt where it can spill. Salt and moisture can contribute to corrosion of metal and electrical components, so a container should be stable and protected from tipping.
So, salt isn’t a magic car hack. If your car repeatedly develops condensation or smells damp, finding the source of the moisture is much more effective.
