What is the substance applied to tires at car washes?

[OLuke]

At car washes, the substance brushed onto tires is a tire protectant. After application, it makes the tires appear dark and shiny, with the function of maintaining the elasticity of the tire's structural molecules to enhance durability. Tires are one of the crucial components of a vehicle, directly contacting the road surface and working in conjunction with the car's suspension to mitigate impacts during driving. To ensure even tire wear on the same vehicle, it's recommended to rotate the tires every 5,000 kilometers and perform a four-wheel alignment every 5,000 to 10,000 kilometers to prevent abnormal excessive wear. Additionally, it is not permissible to install tires of different models or with significant differences in wear on the same axle.