What Causes Blurriness on the Inside of a Car Windshield?
2 Answers
When the windshield defroster is set to external air circulation, oil vapors from the engine compartment gradually adhere to the glass. Simply wiping with a cloth won't help. You can prepare a small spray bottle (like those used for cosmetics) with a mixture of dish soap and water. Spray generously on oily areas and wipe with paper towels. For thorough cleaning, apply more soapy water and scrub with a dry cloth repeatedly—though this can be quite labor-intensive. Here are some windshield maintenance tips: 1. Use appropriate wiper blades: Always use specialized or suitable wiper blades and replace them regularly (typically annually) to prevent scratching the windshield. 2. Clean frequently: Keep the windshield clean. If debris is stuck, avoid using the wipers; instead, carefully remove it with a towel or other tools. 3. Use dedicated glass cleaner: Always opt for automotive-specific glass cleaner. This ensures clear visibility while enhancing lubrication and reducing windshield wear.
The most common cause of a blurry windshield interior is high humidity inside the car, especially on cold or rainy days. When warm air meets the cold glass surface, it condenses into water droplets, causing blurriness. I often encounter this issue while driving in winter because human breath or damp clothing releases moisture, obstructing road visibility. Additionally, dirt, fingerprints, or grease on the glass can easily cause blurring. For instance, accidentally touching the glass with oily hands while driving leaves residue that becomes problematic if not wiped off for days. Poor air circulation inside the car, such as a dirty cabin air filter, can also affect humidity control. The solution is simple: lightly wipe the interior with a slightly damp cloth before driving, activate the air conditioning's defogging function, and maintain good ventilation to reduce moisture sources. Regular cleaning can prevent recurring issues.
