The tip “Keep a glass of salt in your car! It’s a useful trick…” usually refers to using salt to reduce moisture inside the car. It’s a simple home hack people share online.
🚗 Why people put salt in a car
Salt can absorb moisture from the air (it’s mildly hygroscopic). When a car stays closed for long periods—especially in humid or rainy weather—moisture can build up inside.
Putting a small container or glass of salt in the car may help:
1. Reduce foggy windows
- Moist air causes windows to fog up from the inside.
- Salt may absorb some moisture, which can slightly reduce condensation.
2. Prevent musty smell
- Excess moisture can create damp odors in car interiors.
- Drying the air a little can help reduce that smell.
3. Help limit mold growth
- Mold grows in damp environments.
- Lower humidity makes mold less likely.
⚠️ Important things to know
- It’s not a powerful dehumidifier like commercial products.
- Use a stable container so it doesn’t spill (salt can damage fabrics or metal if wet).
- Replace the salt when it becomes damp or clumpy.
✅ Better alternatives
Many people instead use:
- Silica gel packs
- Commercial car dehumidifier bags
- Charcoal moisture absorbers
These absorb more moisture than plain salt.
✔ So the trick isn’t magic, but it can help a little with humidity inside a car.
If you want, I can also show you 7 strange but useful car hacks most drivers don’t know 🚗.
