Why do water droplets not fall off the car after rain?

[DelTyler]

This is because the car has been waxed, which generally prevents water droplets from running off. The benefit of waxing is to protect the car's paint. Below is a related introduction about car waxing: 1. The function of car waxing: As a traditional item of car beauty, the function of waxing is to waterproof and protect against acid rain. Due to the protection of car wax, the amount of water droplets adhering to the car body is significantly reduced, with an effect ranging from 50% to 90%. Another function is to protect against high temperatures and ultraviolet rays. As the weather gets hotter, cars that are driven or parked outdoors year-round are prone to paint aging and fading due to sunlight exposure. The film formed by waxing can reflect some of the light. 2. Precautions for car waxing: The interval between waxing should vary depending on the driving environment and parking location of the vehicle. Before waxing, it is necessary to thoroughly clean the dirt and dust on the car's exterior.