What to Do When the Rearview Mirror is Unclear on Rainy Days?

[TuckerLynn]

On rainy days when the rearview mirror is unclear, you can use methods such as heated mirrors, installing rain guards, applying specialized rain repellent, rubbing soap, or using insect repellent water. Here are some relevant methods for improving rearview mirror visibility on rainy days: 1. Using soap or detergent as a cleaning agent: Cleaning agents contain surfactants, whose hydrophobic groups physically repel water, preventing droplet formation. The process is simple: apply soap water or detergent water to the rearview mirror, either by wiping or spraying, and let it dry. While this method is very convenient, its effectiveness is short-lived, lasting only about 2 days. 2. Applying wax to the rearview mirror: When water comes into contact with a waxed surface, the internal cohesion of the water becomes greater than its adhesion, preventing droplet formation—similar to the principle observed with lotus leaves. Although waxing is also simple, wax is highly affected by temperature. If not applied correctly, it can impair visibility, so this method is not commonly used.