How to Deal with Blurry Windshield in Rainy Weather?
2 Answers
When driving in the rain, you can defog the windshield by setting the air conditioning to blow air towards the front windshield. There are two main causes of windshield fogging: 1. High humidity: When the window temperature is below the dew point at a given air humidity level, condensation forms on the window surface. 2. Low temperature: When there is a temperature difference between the two sides of the window, and the saturated vapor pressure on the cooler side is lower than the surrounding environment's vapor pressure, moisture gathers on the glass surface, forming fog. Here are some precautions for driving in the rain: 1. Maintain good visibility: Besides driving cautiously, promptly turn on the windshield wipers and use low beams and fog lights in dim weather. If there is frost on the front windshield, turn on the AC and direct the cold air towards it. If the rear windshield is frosted, activate the rear defroster to quickly clear it and avoid obstructing the view of vehicles behind. 2. Prevent wheel skidding: Rainwater on the road acts as a 'lubricant' between the tires and the surface, reducing braking efficiency and increasing the risk of skidding. Therefore, drivers should hold the steering wheel firmly with both hands, maintain a straight and low-speed course, and brake gently when turning to avoid wheel lock-up and skidding. If the front wheels skid, steer in the opposite direction; if the rear wheels skid, steer in the same direction as the skid—never steer the wrong way. 3. Drive slowly in low gear: Experienced drivers know to use second or third gear and keep speeds below 30-40 km/h, regardless of road width or condition. Always monitor the distance between your car and others, and be mentally prepared to take emergency measures. When stopping, slow down about 100 meters in advance and brake lightly to give following vehicles enough time to react, avoiding sudden stops that could cause collisions or rear-end accidents. 4. Avoid getting stuck in water: When encountering flooded roads, underpasses, or deep tunnels, first stop to check the water depth. A simple rule is that the water should not exceed the exhaust pipe height; if it does, find an alternate route. If the water only submerges less than half of the tire, engage first gear, maintain steady throttle, and drive straight through at low speed without stopping, shifting gears, or making sharp turns to prevent stalling or engine damage. 5. Avoid accelerating to overtake: While driving in the rain, always pay attention to the speed and direction of the vehicle ahead. Never overtake just because the car in front is moving slowly, especially on highways where lane speeds are higher, visibility is reduced, and roads are slippery. A slight steering adjustment during overtaking can easily cause wheel skidding, leading to side-swiping or rollover accidents. 6. Prevent hitting pedestrians: Rain can impair the vision, hearing, and reactions of pedestrians with umbrellas and cyclists in raincoats, who may dart across the road unexpectedly. Drivers should slow down, honk frequently, and yield patiently. If necessary, stop at a safe spot rather than rushing past pedestrians or cyclists, which could lead to accidents.
Having driven for so many years, the issue of blurry windshields on rainy days is all too common. Here's my solution: First, turn on the wipers to clear the rainwater on the outside, preventing water droplets from obstructing your view. Then, activate the air conditioning's defogging mode and direct cold air at the windshield to quickly eliminate fog. If the wipers aren't clearing properly, it's likely the rubber blades are worn out—best to replace them on a sunny day. For the inside of the glass, apply anti-fog spray in advance; a bottle from the supermarket costs just over ten yuan and lasts a long time. A reminder to everyone: replace the air filter on time, as a clogged one can reduce defogging efficiency. When the windows fog up, avoid wiping them with your hands—it's both dangerous and leaves fingerprints. The correct approach is to slightly open the external air circulation to adjust humidity. Keeping the glass clean is fundamental; a deep cleaning every quarter to remove oil film makes a noticeable difference.
