Engines are often forgotten when it comes to cleaning and washing a car. Onlookers don't see the engine, so most people don't wash it. Most people forget about the dirt, mud and road grime that build up under the hood and on engine components. The engine and engine bay should be cleaned at least a few times a year, but should be done properly to avoid water damage. Learn how to pressure wash an engine and get your engine shining like new without damaging any parts.
Park the car in the shade so that the sun doesn't shine directly on the engine area. Use a trash bag and masking tape to cover the fuse box, battery terminals, throttle body, alternator, injectors and spark plugs. The trash bag can be cut into smaller pieces and taped over and around these parts.
Spray Simple Green on the dirty, greasy areas of the engine. Once the vulnerable parts are covered, the remaining parts can all be sprayed liberally with Simple Green. This greatly loosens grease, oil, mud and road grime. Allow the Simple Green to sit for about five minutes, but don't let it dry or it will leave a haze on the parts.
Use the pressure washer to spray off the Simple Green. A sponge may be needed on really dirty areas. Point the sprayer toward the engine bay, stand back as far away from the engine as possible and spray directly at the parts until the water runs clear (no more foam or bubbles from the Simple Green).
Remove all of the tape and trash bags from the parts. Drive the car for at least five or 10 minutes to dry most of the engine components.
