If you’re asking whether putting a glass of salt in your car actually works, the claim is partly based on a real property of salt but is often exaggerated.
🧂 Why people put salt in a car
A bowl or glass of ordinary table salt is sometimes recommended as a cheap moisture absorber. Salt can absorb some moisture under certain conditions, so the idea is that it might help reduce humidity and condensation inside the vehicle.
However, a glass of dry table salt is not a particularly effective car dehumidifier. Commercial moisture absorbers (often containing calcium chloride or silica gel) generally work much better.
What it might help with
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Minor condensation: It may absorb a limited amount of moisture.
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Musty smell: Reducing humidity can sometimes help indirectly.
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Damp interiors: It may provide a small benefit if the car has mild moisture problems.
⚠️ What salt will NOT do
It won’t reliably:
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Prevent windshield fogging while driving
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Fix a water leak
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Remove significant humidity from a wet carpet
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Repair an air-conditioning/dehumidification problem
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Prevent mold if the underlying water intrusion remains
Also, don’t spill salt on metal surfaces. Salt plus moisture can contribute to corrosion
