
When the side mirrors become foggy, you can turn on the mirror heating system to defog them. Cars equipped with a mirror heating system have heating wires inside the mirror glass. When the mirror heating is turned on, the heating wires will be electrified to generate heat.

















As a long-time driver, I've found that fogging on the side mirrors is mainly caused by temperature differences due to humid weather or high interior humidity. The solution is quite simple: I usually just roll down the windows for a few seconds to ventilate and let the moisture escape; if the car's mirrors have heating function, turning it on will clear the fog in about a minute – many modern cars come with this feature as standard. Additionally, setting the air conditioning to the windshield defrost mode can also quickly remove fog. Never use a towel to wipe, as it's dangerous and likely to leave marks. Instead, spraying some household anti-fog agent on the mirrors for prevention is better. In case of heavy fog affecting visibility, I immediately pull over to a safe spot before taking any action. For prevention, I recommend regularly checking the cleanliness of the mirrors to avoid dust buildup and using the air conditioning's dehumidification feature more often during the rainy season to reduce the chance of fogging, making driving more worry-free and safer.

In the car repair business, I've seen many car owners complain about foggy rearview mirrors. The main reason is the large temperature difference between the inside and outside of the car, combined with high humidity causing water droplets to condense. Simple solutions include activating the defogging function or using the air conditioner to blow cold or hot air for dehumidification; for cars without these features, using a manual heater plug-in or a special anti-fog cloth to wipe the mirror works. Long-term solutions include checking if the sealing strips are aged and leaking air, and promptly repairing or replacing parts if the heating wire is damaged. When fogging occurs, don't panic—turn on the hazard lights and handle it in a safe area. To prevent fogging, developing habits like cleaning the mirrors daily and keeping the air conditioning system dry can significantly reduce the chances of it happening, ensuring a safer drive.

When driving a new car, I particularly on the rearview mirror heating function. Just press a button and the fog dissipates, which is very convenient. Without this feature, rolling down the window for a few seconds to let in some air or adjusting the air conditioning vent direction can also help. Fogging often occurs due to rain or improper air conditioning settings, so checking the weather before driving and adjusting the air recirculation to control humidity is crucial. For safety, if the fog is heavy, it's best to stop and wipe it clean before continuing, rather than risking driving in poor visibility.

Safety first, foggy side mirrors obstructing the view are extremely dangerous. I immediately turn on the defroster and air conditioning blower, or open the window to reduce humidity; if necessary, pull over and gently wipe with a tissue. For prevention, regularly clean dirt off the mirror surfaces, install mirror heating kits or apply anti-fog spray to avoid frequent fogging. Remember, check humidity settings before driving in cold and damp weather to ensure clear visibility.

Having driven for many years, my core approach to dealing with foggy rearview mirrors is prevention-first. First, clean the mirror surface to reduce dust attracting moisture; while driving, turn on the air conditioning in dehumidification mode or slightly open the window for ventilation. If fogging occurs, use an anti-fog cloth for quick wiping or activate the heating function. In the long run, installing heated rearview mirrors or applying anti-fog spray is the best strategy, as fogging stems from temperature differences and humid environments. Controlling cabin humidity and avoiding direct air conditioning airflow can minimize issues, ensuring smooth driving without disruptions.


