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

[LaLane]

This is due to the car being waxed, which generally prevents water droplets from running off. The benefit of waxing is to protect the car's paint. Below is relevant information about car waxing: The role of car waxing: As a traditional aspect of car care, waxing serves to waterproof and protect against acid rain. The protective layer of wax significantly reduces the amount of water droplets adhering to the car body, with an effectiveness ranging from 50% to 90%. Another benefit is protection against high temperatures and UV 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. 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 essential to thoroughly clean dirt and dust from the car's exterior.