What is the reason for a patch of water mist on the car display that cannot be wiped off?

[VanCassidy]

This phenomenon is caused by moisture on the display. Below is an introduction to car displays: 1. Overview: The main uses of in-car displays include adding a rearview camera for reversing or for advertising on buses, subways, trains, etc. The mainstream products on the market typically come with features such as TV, external speakers, SD card reading, USB, etc. 2. Specifications: Basic specifications of in-car displays must include dust and shock resistance. In terms of temperature, they must be able to withstand extreme temperature differences ranging from -30°C to 85°C, or even up to 120°C. This is because the liquid crystal in LCD panels can freeze in low-temperature environments, leading to display malfunctions or complete failure.

[MaggieRose]

There's a patch of moisture on the car display that can't be wiped off, which I think is quite common, possibly due to a screen sealing issue. The display isn't completely sealed; there are rubber gaskets around the edges that can let air in when they age or get damaged, allowing moisture to condense inside. Wiping the surface won't help because the fog is inside. Other causes include water seeping in during cleaning or large temperature differences causing condensation on the surface. Once moisture gets into electronic screens, it can lead to short circuits or display errors over time, making it dangerous when you can't see navigation or warning signs while driving. It's advised not to tamper with it yourself—try using the air conditioning's dehumidifying function to see if it helps, but it's best to visit a professional auto shop as soon as possible to check if the seals need replacing. For prevention, avoid parking outdoors during the rainy season and regularly inspect the seals on doors and windows.

[VanRosalie]

My car screen keeps fogging up and won't wipe clean - so annoying! I suspect the screen isn't airtight, and moisture seeps in through gaps when it's humid. Wiping the surface is useless. Maybe car wash water got in before and wasn't dried properly, leaving fog-like water marks after drying. A quick fix is putting some desiccant near the screen - I've tried it and it absorbs some moisture, but doesn't solve the root problem. A friend warned against using alcohol to clean the screen as it can corrode the coating and leave hazy residue. Leaving it unfixed long-term makes the display blurry and distracting - not safe for driving. Might as well drive to a repair shop - they have specialized tools to fix or replace screen components. When parking, choose shady spots to reduce humidity, and remind mechanics to check screen sealing during regular maintenance.

[SanNorah]

Seeing condensation on the display that can't be wiped off requires caution. The root cause is often poor internal sealing, allowing moisture to seep in and form fog, which affects visibility and makes driving dangerous. Large temperature differences, such as using hot air from the AC in cold weather, can also cause condensation. A quick fix is to turn on the AC in dehumidification mode to disperse the fog, but for a permanent solution, it's best to have a technician check if the seals need replacement to prevent circuit damage. Related tip: Clean the screen with a soft, dry cloth to avoid leaving moisture.

[LeMackenzie]

Regarding the issue of unremovable fogging on car screens, I believe the core problem lies in air leakage from internal electronic components or seal failure allowing moisture intrusion and condensation. Temperature differentials exacerbate the issue, such as when washing the car on a hot day followed by immediate sun exposure. Cleaning residue or damaged coatings can also resemble fog marks. Long-term neglect may lead to burned-out screen circuits, creating high risks of sudden blackouts while driving. Professional diagnosis is recommended to determine whether seal replacement or entire screen replacement is needed. For daily maintenance, reducing interior humidity by closing windows when parked and using air conditioning for dehumidification can be helpful.

[VonAutumn]

I've encountered this issue where the fog inside the screen can't be wiped off, possibly due to aging or cracked seals around the screen edges, allowing moisture to seep in during high humidity weather. It's similar to when a car door isn't closed tightly and lets dampness in. As a DIY solution, using a hairdryer on low heat to gently blow air around the edges can remove some of the fog, but be careful not to get too close to avoid damaging the screen. I've tried this on an old car and it worked temporarily, but it's not a long-term fix. For a permanent solution, visit a repair shop to check the seals or replace the parts. Driving safety comes first—don't stubbornly rely on navigation if the screen is fogged up. Regularly maintain and inspect the rubber seals on car doors and windows to prevent similar issues.