What should I do if my car windows fog up when it rains? Summary of popular solutions across the network
Recently, many parts of the country have experienced rainy weather, and fogging of car windows has become a hot topic among car owners. Based on the discussion data of the entire network in the past 10 days (as of November 2023), we have compiled the following practical solutions and precautions.
1. Analysis of the principle of car window fogging
The essence of fogging is the result of the temperature difference + humidity between the inside and outside of the car:
| Type | forming conditions | Prone scenarios |
|---|---|---|
| Fogging outside | Glass temperature＜dew point temperature | After rain in summer/early morning in winter |
| Fogging inside | Humidity in the car＞70%+glass low temperature | Carrying passengers on rainy days/turning on the heater |
2. Top 5 popular solutions on the entire network
| method | support rate | Operation steps | Things to note |
|---|---|---|---|
| Air conditioning defogging | 89% | 1. Turn on AC 2. Adjust to external circulation 3. Aim the wind direction at the windshield | Need to be used with warm air in winter |
| Anti-fogging agent | 76% | 1. Clean the glass 2. Spray evenly 3. Wipe with dry cloth | Effects last 3-7 days |
| Window convection | 68% | Windows on both sides open 1/3 each | Only suitable for light rain weather |
| Apply soapy water | 55% | Apply evenly after diluting | Requires regular recoating |
| Heated rearview mirror | 92% | Press the heating button | Automatic shutdown takes 10-15 minutes |
3. Response strategies for different scenarios
According to actual measured data on Douyin, Xiaohongshu and other platforms:
| scene | best solution | average effective time |
|---|---|---|
| short commute | Spray anti-fog agent in advance | Preventive 0 seconds |
| Driving at high speed | Air conditioner MAX defog mode | 30-45 seconds |
| Carrying passengers | Air conditioning + window opening combination | 1-2 minutes |
| extreme humidity | AC+heat+rear window heating | 3-5 minutes |
4. Correction of common misunderstandings among car owners
1.Misunderstanding:Wipe the mist directly with a rag
Correct answer:Will cause secondary fogging, the defogging system should be turned on first
2.Misunderstanding:Long-term use of internal circulation
Correct answer:External circulation can effectively reduce the humidity in the car
3.Misunderstanding:Cold air defogs faster
Correct answer:Warm air defogging lasts longer in winter (requires AC)
5. Advanced protection suggestions
1. Check the air conditioning filter element regularly (it is recommended to replace it every 10,000 kilometers)
2. Place a dehumidification box in the car (calcium chloride material is recommended)
3. Apply high-quality anti-fog film (transmittance >70%)
4. Install the rain eyebrow (can keep the window slightly open)
According to actual measurements by Zhihu Automotive V@Che.com, the combined use of the above methods can increase the defogging efficiency by 300%. Driving safely on rainy days is no small matter. It is recommended that car owners keep it as a backup.
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