The claim “put a glass of salt in your car” is a popular online tip, but the reasons often shared with it are exaggerated or misleading.
Some people place a cup or container of salt in a car for these possible reasons:
- Reducing moisture: Salt absorbs water from the air, so it may help a little with small amounts of humidity or condensation. However, a small glass of salt is usually far less effective than a proper car dehumidifier or moisture absorber.
- Odor control: Salt may trap some moisture that contributes to smells, but it does not remove odors as effectively as activated charcoal or dedicated odor absorbers.
- Emergency use: Some drivers keep salt in their vehicle for winter conditions because salt can help melt small amounts of ice on surfaces, though a small household container is not a substitute for proper road salt.
A few viral claims—such as salt in a car “protecting against accidents,” “detecting problems,” or providing major health/energy benefits—do not have scientific support.
If you want to reduce car fogging, dampness, or bad smells, more reliable options are:
- Keep the cabin air filter clean.
- Fix water leaks around doors, windows, or the trunk.
- Use an automotive moisture absorber (often filled with silica gel or calcium chloride).
- Run the air conditioner with the defog setting when windows fog up.
