If you’re asking about the viral “put a glass of salt in your car” tip, there is a small grain of truth behind it—but social-media posts often exaggerate what salt can do.
🧂 Why people put salt in a car
The usual claim is that a bowl or glass of salt will absorb moisture and help prevent:
- condensation on windows,
- a damp smell,
- moisture inside the cabin.
Salt is hygroscopic to some extent, meaning it can attract moisture. However, an ordinary glass of table salt is not a particularly effective car dehumidifier. It can become damp or clump, but it won’t remove large amounts of water from a vehicle.
🚗 If your car has persistent condensation
A better approach is to find the source of the moisture:
- Check for wet carpets or floor mats.
- Make sure doors, windows, and the trunk are sealing properly.
- Check for water leaks.
- Use the car’s air conditioning with the defroster—the A/C removes moisture from the air even when the weather is cold.
- Keep the cabin reasonably ventilated and remove wet items.
If the windows repeatedly fog up despite these measures, there may be a water leak or HVAC problem that needs attention.
Bottom line: A glass of salt isn’t a dangerous trick if securely placed, but it isn’t a miracle solution for car moisture. A proper moisture absorber (such as silica gel or a purpose-made automotive dehumidifier) is generally more effective.
