Try to remove ice and snow from your shoes before getting in your vehicle.As they melt, they create moisture build-up, causing windows to fog on the inside. You can reduce this fogging by turning the air recirculation switch to the OFF position. This brings in drier, fresh air. Also, run your air conditioner which becomes a dehumidifier for a few minutes
Remember to brush off any snow that might be on your floor matt or around your foot pedals. Prevent slick surface inside your vehicle as much as possibe. Drive Safe & Take extra time!