This chapter presents a comprehensive overview of high-pressure cleaning trucks, which are essential for urban cleanliness and infrastructure maintenance. Firstly, it introduces the functions and classifications of high-pressure cleaning trucks, highlighting their diverse roles in cleaning and maintenance. Secondly, the chapter provides a detailed introduction to typical products, with a focus on pavement cleaning vehicles and guardrail cleaning vehicles. For pavement cleaning vehicles, key components, operational features, and multiple cleaning operations are illustrated, supported by relevant figures and data tables. Guardrail cleaning vehicles are also examined in terms of structure, operational principle, and main performance parameters. Finally, the chapter addresses common faults and troubleshooting procedures for high-pressure cleaning trucks, offering practical guidance with reference tables. The chapter concludes with a discussion of recent development trends in the field.