This is another common clickbait “life hack,” and it’s mostly misleading or exaggerated.
The claim
“Put a glass of salt in your car to solve problems like fog, moisture, odors, etc.”
What salt actually does
Salt is hygroscopic, meaning it can absorb some moisture from the air. So in theory, it can slightly reduce humidity in a very small enclosed space.
Why it doesn’t really work in a car
A car interior:
- is not airtight (air constantly enters/leaves)
- has much more moisture than a small glass of salt can handle
- experiences temperature swings that cause condensation faster than salt can absorb it
So the effect is:
- negligible for fog or dampness
- short-lived even if it works a little
Possible downsides
- Spilled salt can damage interior surfaces over time
- Moisture can turn it into a clumpy mess
- Doesn’t address the real cause of fog (temperature difference + humidity)
What actually works better
If the goal is to reduce fog or moisture:
- Use the car’s defogger + AC together
- Fix leaks (common cause of damp carpets)
- Use proper car dehumidifier packs (silica gel / calcium chloride products)
- Keep windows slightly ventilated when safe
Bottom line
Putting salt in a glass in your car is mostly a social media hack, not a practical solution. It won’t meaningfully solve humidity or fogging issues.
If you want, I can give you a few actually effective low-cost tricks for foggy windows or damp smell in cars.
