Why is the windshield blurry?

Monday, 21 February, 2022

Do you Know


Sometimes when driving a car, the front or rear vision becomes blurry, thus interfering with sight and observation while driving a car.

Based on a study conducted by PIARC (World Road Association) and FIA (Federation Internationale d'Automobile) in a book "the role of road engineering in combatting driver distraction and fatigue road safety risk", there are several stages of a driver's response which is managed by the human's mind as a result of views and observations on the road before taking action, namely:

1.     Preparation has a time of 3-4 seconds.

2.     Anticipation has a time of 2 – 3 seconds.

3.     Driver response has a time of 2-3 seconds.

4.     Vehicle response has a time of 1-2 seconds.

If the view and observation while driving is distracted because of the blurry glass, then this will greatly affect the vehicle response managed by the driver in response to road conditions ahead.

It is very important for the driver to understand, whether the blurred vision is due to moldy car windows or dirty car windows, or maybe the driver has vision problems.

Blurry glass can be caused by:

  •        Dirty rainwater mixed with dust from the road;
  •        Thick dust
  •        Moldy glass.

The moldy glass will not be easily removed by simply washing and drying.


Moldy Glass


This note will focus on blurry vision caused by moldy glass.

Moldy glass can be caused by several things, the following 3 things are common ones that can cause moldy car windows.

1. Rainwater

At this time, uncertain rainy time, which could be in the morning, afternoon, or evening/night. If the rainwater is not rinsed and dried immediately, then the rainwater sticks on the windshield which is then left exposed to heat and humidity, mold will appear on the windshield of the vehicle.

2. How to Wash a Car

The wrong car washing method can also cause a moldy windshield. Make sure that every time you wash the car, the water that sticks to the windshield is wiped and dried properly.

 3. Water Quality

The water quality used for car washing will impact the occurrence of mold on the car glass. Such as brackish water or water that contains a lot of dirt particles. It can also cause mold on the windshield.


Cleaning Mold on Windshield


If a car’s windshield is moldy, it is better to immediately take action to remove the fungus. A good driver's view and observation will depend on the clear vision of the windshield, in addition to the driver's focus.

First, identify whether your car's windshield is moldy or not. You can wash it and dry it in the daylight, see if the spots on the windshield are still there or have disappeared.

At night, after washing and drying, if the spot remains on the windshield, it causes the other car’s beam light from the opposite direction will be glow and dim, which means the mold of glass remains.

Here are some tips that are shared by https://otomotif.kompas.com/read/2020/02/15/092200215/tidak-perlu-ke-bengkel-begini-cara-mudah-bersihkan-jamur-kaca-mobil?page=all. If the car mold is still there and you have difficulty self-cleaning, then immediately go to the repair shop.

Remember, clear vision helps you observe road conditions as you drive, you as a driver, only have seconds to act on the motion of the vehicle.