You can clean it with a household degreaser. We may need to scrub depending on how dirty the engine is.
Clean the truck engine by spraying it with a degreaser. Degreaser stays for a little time to break the grease and grime which further removes with the pressure washer.
We can safely wash the truck engine following certain precautions. We can use a dry towel or other air-dry sources to avoid water spots.
Truckers leave their truck running to regulate the inside temperature for a comfortable stay and to keep the truck engine warm in freezing temperatures.
Cool your engine & prepare gear, remove dust & dry debris from the engine, apply degreaser, do scrubbing, rinse with a pressure washer, and use microfiber to dry.
The cost of truck engine steam cleaning depends upon engine size, fuel type, engine condition & age of the truck engine.