In the UAE, particularly during the humid summer mornings or after desert camping, the most effective and reliable method is to use the air conditioning in cold mode, directed at the windscreen and front side windows, with the air recirculation button turned off. This method is endorsed by local driving experts and aligns with vehicle manuals for GCC-spec cars. The science is straightforward: the car's A/C system acts as a dehumidifier. When you set it to cold and turn off recirculation, it draws in outside air, removes its moisture through the evaporator, and blows dry, cool air onto the glass, rapidly clearing condensation. This is far quicker and more thorough than using the heater, which can temporarily worsen fog before clearing it. For a typical family sedan like a Toyota Camry driving on Sheikh Zayed Road on a humid August morning (approx. 80% humidity, 28°C at 6 AM), this method can clear a fully fogged windscreen in 60-90 seconds. A common mistake is using recirculation, which just cycles the already humid interior air. For persistent issues, often seen in older cars, it may indicate a failing cabin air filter (which should be replaced every 12-18 months in dusty UAE conditions) or a minor coolant leak into the heater core.
