how to clean car engine? Once the engine is clean and dry, inspect it for any visible signs of wear or damage, such as cracked hoses or loose connections. Addressing minor issues during cleaning can help prevent future problems. Repeat this cleaning process as needed, typically every 6–12 months, depending on driving conditions and exposure to dirt or grime. Begin by removing loose debris from the engine bay with compressed air or a brush. This step prevents material from combining with water and causing a muddy mess throughout the cleaning procedure. A thorough sweep also improves access to difficult-to-reach locations, resulting in a more efficient clean.