Normally, you can wash your car 10 minutes after turning off a hot engine. The main reason for this is that the surface temperature of the car body is too high, and washing with cold water may damage the car paint. The following are precautions for car washing: Avoid Using Random Detergents: Do not use laundry detergent, scouring powder, or low-quality soap when washing. These detergents contain alkali, which can strip the oils from the paint surface and accelerate paint aging. Therefore, it is generally recommended not to use detergents when washing your car. For highly corrosive stains on the car body, such as asphalt, oil stains, bird droppings, or insect feces, which are difficult to clean, soak them with soapy water first. Avoid using gasoline, stain removers, or thinners to clean these stains. Avoid Using High-Pressure Water Jets on the Car Body: Excessive water pressure can damage the car's paint surface. If there is stubborn dirt or mud on the car, wet it with water first and then rinse it off. Use a dispersed water stream for spraying. Avoid using plastic brushes or blades to scrape off hard stains to prevent damaging the paint. Avoid Using Water Other Than Soft Water for Cleaning: Do not use water other than soft water, including hot water, alkaline water, or hard water, as these substances can damage the paint. Washing with hard water may leave marks and a film on the car's surface after drying.
