What is the reason why the windows on both sides cannot wipe off rainwater when raised or lowered?

[McKate]

The situation where the windows on both sides cannot wipe off rainwater when raised or lowered is likely due to aging window rubber seals or improper glass installation. Here are several reasons why wipers may not clean effectively: 1. Excessive force from the wiper arm: The solution is to check the wiper arm spring. 2. Insufficient curvature of the wiper: The solution is to replace the wiper with poor curvature and purchase a wiper with better curvature. 3. Bird droppings or other particles on the car's glass causing stains to spread when wiped: The solution is to clean the glass with a cloth before driving and also wipe the wiper rubber strips clean. 4. Cracks in the wiper rubber strips.

[RyanRose]

I've encountered this issue too. As a veteran driver with over a decade of experience, I believe the main cause is aging window seals. Over time, they harden or deform, losing their tight fit against the glass, making it impossible to wipe off rainwater when rolling the windows up or down. If there's oil or dust on the glass itself, it tends to attract water, rendering the window movement ineffective. Especially after rain, dirt accumulates faster, further compromising the seal. I recommend regularly cleaning the edges of the window seals with warm water and a bit of dish soap, then drying them with a soft cloth to restore some elasticity. If cleaning doesn't help, the seals might have reached the end of their lifespan and need replacing—doing it yourself costs just a few dozen yuan. Also, check for any debris stuck in the window tracks and clean them out if necessary. Paying extra attention to both the inside and outside of the windows during regular car washes can prevent this issue. After all, poorly functioning windows can obstruct your view while driving, which is quite unsafe.

[AngelaLynn]

From a practical perspective, the ineffectiveness of window wipers during window operation is often caused by issues with the rubber seals, such as dryness-induced deformation or cracks, which prevent proper water wiping during movement. Another possible cause is unclean glass surfaces, with accumulated oil film or dust, rendering the wiper ineffective when the window is operated. I usually start by checking the elasticity of the rubber seals, pressing them by hand to see if they rebound normally; if the rebound is slow, they should be cleaned or replaced. If the window mechanism lacks lubrication or is stuck, it can also affect performance—try applying some silicone-based lubricant. Address any issues promptly, as impaired visibility during rain can be dangerous; I've witnessed minor accidents caused by this. I advise everyone to inspect their window systems before the rainy season and perform necessary maintenance—it's cost-effective but significantly improves functionality.

[LaAmy]

When I first started driving, I also wondered why the window couldn't wipe off the rainwater when rolled up and down. Later I learned it's because the rubber seals aren't soft enough or have gaps. Dirt accumulates on the seals, and rainwater flows away through the gaps when the window moves. I suggest simply cleaning the seals and glass with alcohol or a dedicated cleaner, which can improve the situation significantly. If the seals have hardened too much, consider replacing them - don't delay too long to avoid poor visibility during rainy days.