As car maintenance,you might need to clean your engine bay once or twice a year depending on the driving miles.Most people are worried about getting the various components and systems wet then damaged by water.Some think use seafoam or degreaser for engine but still some water needed.

How to safely clean an engine bay without water? there is dry ice cleaning machine to clean engine surface.If for engine inside cleaning,HHO engine carbon cleaner machine will be your best choice.