With this 3 simple tricks you may be able to defog and prevent car windows fogging. In first part, for dehumidification you need to fill a pair of socks with silica crystals cat litter and put them on the dashboard over night. Then you need to prepare windows for preventing moisture to acumulate on them. For this, the shaving foam is the best. Now, most people are using car heating and ventilation the wrong way for defogging. This video reveals the right settings for them. Enjoy !