The basic idea is incredibly simple.
You place a container filled with salt inside the vehicle and leave it there for a period of time.
As humid air comes into contact with the salt, the salt may take up some of that moisture.
If the air is particularly humid, you may eventually notice that the salt becomes:
Clumpy
Damp
Sticky
Harder than usual
Slightly wet around the bottom of the container
Those changes indicate that moisture has interacted with the salt.
But don’t expect the entire container to turn into a puddle.
And don’t assume that dry-looking salt means your car has no moisture problem. Salt isn’t a moisture meter.
Why Your Car Gets So Damp in the First Place
Before reaching for a glass of salt, it’s worth figuring out where the moisture is coming from.
This is often much more important than the hack itself.
Wet floor mats
Rain and snow can accumulate underneath your shoes and soak into floor mats.
If the mats stay damp, they can continuously release moisture into the cabin.
Wet clothing
Coats, shoes, gloves, and umbrellas can introduce surprisingly large amounts of moisture.
Condensation
Temperature differences between the inside and outside of the vehicle can cause condensation to form on windows and other surfaces.
Spilled drinks
Even a relatively small spill can become a persistent source of humidity if liquid gets underneath carpeting.
Water leaks
This is the big one.
If your vehicle repeatedly develops damp carpets even when you haven’t brought in rain or snow, there could be a leak around a door seal, windshield, sunroof, trunk, or another area.
A glass of salt won’t solve that.
Can Salt Stop Car Windows From Fogging?
Not directly.
Fogging occurs when water vapor in the cabin condenses on a cooler surface, such as the inside of the windshield.
The most effective way to clear fogged windows is to use your vehicle’s climate-control system correctly.
Turn on the defroster and use the ventilation system to reduce condensation and improve visibility.
If your vehicle’s air-conditioning system is available, it can also help remove moisture from the air as part of normal climate-control operation.
The salt trick is not a substitute for clearing a fogged windshield.
Never drive with visibility obstructed by condensation.
A clear windshield is a safety issue, not merely a comfort issue.
How to Try the Salt Trick Safely
If you still want to experiment with the hack, keep it simple.
Step 1: Choose a stable container
Use a sturdy, wide-bottomed glass or another stable container.
Don’t use something tall and easy to knock over.
Step 2: Add ordinary salt
Fill the container with dry table salt.
You don’t need an enormous amount.
Step 3: Place it somewhere secure
This is extremely important.
Do not put a loose glass container where it can slide, tip over, or interfere with driving.
Avoid the driver’s footwell, pedals, steering area, seat edges, or anywhere it could become a projectile during sudden braking.
A parked vehicle is the appropriate place for an experiment like this.
Step 4: Check it periodically
Look at the salt after several hours or overnight.
If it becomes damp or clumpy, moisture has interacted with it.
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