Replace or refresh every 2–4 weeks (when salt clumps or dissolves)

💡 Pro tip: Cover the top with a coffee filter or paper towel secured with a rubber band—lets air in, keeps dust out.

🔬 Why This Hack Beats Store-Bought Solutions

💵 Cost

Pennies

$15–$30

🔋 Power Needed

None

Some need charging

🔁 Maintenance

Dump & refill

Empty reservoirs, recharge

🧪 Effectiveness

Gradual, steady

Fast but short-term

🛠️ Setup

Instant

Often requires clips or hooks

And unlike chemical sprays or gels, salt is non-toxic, eco-friendly, and kid/pet-safe.

🚗 When This Hack Shines the Most

❄️ Winter mornings: Reduce window fog before you even turn on the heat

🌧️ Rainy seasons: Keep carpets and seats dry

🏕️ Camping/RV life: Prevent mold in stored vehicles

🚙 Older cars: Combat lingering damp smells

🚘 Cars parked outside: Fight overnight condensation

Even if you live in a humid climate like Florida or coastal areas, this tiny trick makes a noticeable difference.

💡 Pro Tips for Maximum Impact

🧂 Use coarse salt or rock salt —lasts longer than fine table salt

🔄 Refresh regularly —if salt turns mushy, it’s full. Dump it, add new salt.