Salt is naturally hygroscopic, meaning it absorbs moisture from the air. Placing a small open container of salt on the dashboard, center console, or floor allows it to pull excess humidity from the cabin. This passive method helps reduce window condensation, keeps fabrics drier, and costs almost nothing. Lower humidity also improves air quality. Moist environments allow bacteria and mildew to thrive, which often causes lingering odors.
By absorbing excess moisture, salt helps prevent these smells before they start, creating a fresher and healthier interior—especially helpful for people with allergies or sensitivities. Other household items can work as well. Newspapers absorb moisture effectively when placed under seats or in footwells, while silica gel packets can be tucked into glove compartments or door pockets to target problem areas.