Car Windshield Dehumidifier Clear your foggy windshield fast Solve the problem of foggy, misty and even icy inside car windows Filled with moisture-absorbent activated carbon granules, the durable pouch can be placed on the seat, atop the dashboard, in the trunk, or wherever you want to extract humidity. After about three months, simply dry the pouch on a radiator or in the oven, and its ready to reuse.