That’s a viral “car hack” claim, and it’s mostly misleading or misunderstood.
🧂 What the claim says
It suggests keeping a glass of salt in your car, supposedly recommended by a police officer, as a “useful trick.”
🧠 What salt actually does (in reality)
Sodium chloride can:
- Absorb a small amount of moisture from the air (limited effect)
- Help slightly reduce humidity in a very small enclosed space
But in a car:
- The effect is very weak
- It won’t meaningfully “protect” the vehicle in most conditions
🚗 Why people share this idea
These posts usually claim salt will:
- Prevent fogging or moisture ❌
- Stop rust in the car ❌
- Improve air quality significantly ❌
👉 These claims are not supported by automotive experts.
💡 What actually works better
If the goal is moisture or fog control:
- Use proper car dehumidifier packs (silica gel or calcium chloride)
- Run AC with defrost mode
- Fix water leaks in the car
- Keep windows slightly ventilated when safe
⚠️ Possible downsides of salt in a car
- Can spill and create mess
- May increase corrosion if it contacts metal surfaces directly
- Not designed for automotive use
🧠 Bottom line
- Salt has limited moisture-absorbing ability
- It is not a recommended or effective car maintenance trick
- Better commercial solutions exist and work more reliably
If you want, I can list real car hacks that mechanics actually recommend 👍
