55.2-59 need to buy heater...defrost?? advice

[dsraven]

when I was still on the job as a firefighter the fire engine cab would fog very badly after a big fire in the winter and 4 or 5 firefighters coming back to the station with soaking wet duty gear. we had dash mounted fans that could blow air across the windshield to help clear the fog.that idea could be used with magnet mounted fans so you only see them when you pull them out and use them. plug into a cig lighter possibly