The application of cleaning machines is also crucial in the pre-treatment process of car spraying. The surface cleanliness before spraying directly affects the adhesion and appearance quality of the coating. Traditional cleaning methods often struggle to thoroughly remove surface impurities such as oil and dust, while ultrasonic cleaning machines can efficiently accomplish this task. It utilizes the impact force of high-frequency sound waves to peel off surface dirt and impurities, providing good surface conditions for subsequent spraying processes. This not only improves the quality and efficiency of spraying, but also reduces the defect rate, saving costs for the enterprise.