Why can't the foggy front windshield be wiped clean?

[LaBenjamin]

The foggy front windshield that cannot be wiped clean may be caused by damage to the car window film, and it is necessary to have it inspected and repaired as soon as possible. Below is relevant information about car window film: 1. Introduction: Car window film involves applying a thin film-like material to the front and rear windshields, side windows, and sunroof of a vehicle. This film is also known as solar film or heat-insulating film. 2. Function: It mainly blocks ultraviolet rays, reduces heat, prevents injuries from shattered glass, and reduces glare. Additionally, due to the one-way transparency of the solar film, it helps protect personal privacy. 3. Principle: High-heat-insulating metal film layers are created through vacuum deposition or magnetron sputtering technology, using metals such as aluminum, gold, copper, and silver. The outer shell electrons (free electrons) in the metal materials are generally not bound by the atomic nucleus. When exposed to light waves, the electric field of the light waves causes the free electrons to absorb the light's energy, producing oscillations at the same frequency as the light. These oscillations then emit light at the same frequency as the original light, which is known as light reflection.

[LaKylie]

I've encountered the issue of a hazy front windshield that won't wipe clean several times. At first, I thought it was just dirt that wasn't cleaned properly, but later I realized it was an oil film buildup on the outside, just like kitchen grease sticking to glass—hard and stubborn. The main causes are oil and dust splashing onto the glass while driving on highways or parking near restaurant exhaust areas. I tried cleaning it with water, which didn't work, and even dish soap foam failed to remove it. In the end, I had to go to a car wash where they used professional oil film remover to fix it. After cleaning, the windshield was crystal clear, making driving much safer. If the oil film is too thick, the glass can become blurry, severely affecting visibility, especially during rain or at night, which increases the risk of accidents. I think it's best to regularly inspect the windshield, such as doing a simple cleaning once a month, to avoid potential hazards. If fogging occurs on the inside, it might be due to overly humid air conditioning—just switch to external circulation mode and blow for a few minutes to dry it out, which is very simple.

[AlinaDella]

Having driven for many years, I find the feeling of unclean glass the most annoying. This foggy effect could be caused by oil film, hard water stains, or internal condensation. The oil film acts like a thin layer, making the surface uneven; hard water stains come from mineral residues left after washing with tap water, which are hard to wipe off and leave streaks. Internal fogging often occurs when the windows aren't tightly closed after parking, leading to high humidity. When dealing with it myself, I first try wiping the inside with a dry cloth. If it's still foggy, I use the car's warm air or defogging function for a few minutes, which works well. External issues are trickier. I recommend using glass cleaner from the supermarket—avoid wet wipes as they can make it worse. Usually, I park in well-ventilated areas and avoid staying in congested zones to reduce oil buildup. If ignored, the glass may get scratched or damaged, and replacement can be costly. In short, take it step by step, and safety comes first.

[Carson]

The front windshield fogging up and being unable to be wiped clean is mainly caused by two reasons. On the outside, it could be due to accumulated grease forming an oil film, which blurs visibility; on the inside, it's often because of improper air conditioning settings or poor sealing, leading to condensation buildup. When I encounter this, I immediately turn on the ventilation or defogging system for temporary relief. For the exterior, buying a specialized cleaning spray and wiping it down usually does the trick. This issue is quite common, and neglecting it can make it hard to see road signs at night, posing significant risks. A simple solution is to emphasize glass cleaning during regular car washes to prevent long-term buildup.