Put 1 Glass of Salt in a Car: Surprising Hack Every Driver Needs to Know

🚗 Put 1 Glass of Salt in Your Car? Here’s What the Hack Really Does

You’ve probably seen the viral tip about placing a glass of salt inside your car overnight to combat moisture and foggy windows. There is a small grain of truth behind it—but it’s often exaggerated.

🧂 Can salt absorb moisture?

Salt can interact with water, but ordinary table salt isn’t an especially effective household dehumidifier. A bowl of salt may have some limited effect in a very humid environment, but it shouldn’t be expected to remove enough moisture from a car to solve persistent condensation.

For better moisture control, use a purpose-made moisture absorber, typically containing a hygroscopic material such as calcium chloride.

🚘 If your car keeps fogging up

Try these more reliable steps:

Use the A/C with the defroster. Air conditioning removes moisture from the cabin air even when you’re using warm air.
Use fresh-air mode rather than continuous recirculation when the cabin is humid.
Dry wet floor mats, clothing, and umbrellas instead of leaving them inside.
Check for leaks around door seals, windows, the windshield, and trunk.
Keep the interior reasonably clean and dry.
⚠️ Don’t leave a glass of salt where it can spill

A container can tip over during braking or cornering. Saltwater can also contribute to corrosion if it reaches metal or electrical components.

Bottom line: A glass of salt isn’t a secret car-saving trick. If you’re dealing with condensation, finding and eliminating the source of moisture—and using the vehicle’s climate-control system properly—is far more effective.