Driving with a misty or foggy windscreen can be a source of anxiety for even the most experienced motorists, often leading to unsafe driving conditions. While many drivers resort to ineffective methods such as simply increasing the car's heating or manually wiping the condensation with a cloth, the Automobile Association (AA) has provided clear, definitive guidance on how to properly defog car windows, aiming to enhance road safety, especially during colder months.

This advice from the AA addresses a common concern, echoed by a Reddit user who expressed frustration and confusion over the lack of a standard, effective method for clearing their car windows. The user highlighted their struggles, noting that despite driving for nearly a year, they remained unsure how to properly defog windows, sometimes resorting to constant wiper use or wiping with a rag, and finding conflicting information online. This query underscores the widespread need for reliable information on this essential safety practice.

According to the AA's expert guidance, the most effective strategy to clear foggy car windows involves a combination of warm and cool air. Motorists should first start their engine and activate the warm air blower, directing it towards the windscreen. Concurrently, the rear windscreen heater and any heated mirrors should be switched on. Crucially, the air-conditioning system should also be engaged, as it plays a vital role in removing moisture from the air, which is the primary cause of misting. If possible, allowing some outside air to circulate into the car can further expedite the defogging process, quickly transforming a misted-over vehicle into one that is safe and drivable.

The AA also issues stern warnings against unsafe practices. Drivers are advised never to use their bare hands or a dirty rag to wipe away condensation. Doing so can leave greasy smears on the glass, which will further obscure vision rather than improve it, and in the case of rings or other jewelry, could scratch the glass surface. If manual intervention is absolutely necessary, a lint-free, absorbent cloth should be used. Furthermore, while the engine is running to clear the windscreen, drivers should remain with their vehicle and utilize this time to clear any ice or snow from the car's exterior, ensuring all-around visibility.

To prevent frost from becoming a problem in the first place, the AA recommends storing vehicles in a garage whenever feasible. For those who park outdoors, placing a piece of cardboard over the windscreen can offer effective protection against frost buildup. The AA also emphasizes the legal ramifications of driving with impaired vision. Attempting to drive off before the windscreen is fully clear of ice or mist is not only dangerous but can also lead to a £100 fine and three penalty points on one's driving licence, underscoring the critical importance of ensuring a completely clear view of the road before setting off.