I wouldn't bother.
What's benefits are you going to get?
Agree with both posts. But I have been know too tackle the dark realms of my corsa c engine bay with a reduced pressure washer. But wouldn't say to anyone it's a good idea.many people claim to have pressure washed their engines bays and say they have had no problems but i really advise against that, the best way is to use a old rag and some engine cleaner stuff and give it all a good wipe down
its true if someone is looking at a car and notices that even the normally dirty spots, engine, door jams and stuff like that are nice and clean it does give the person a better feeling about the carI always have the engine looking clean. Makes the car look nice when it's time to sell, and shows it's been looked after hence increasing the asking price a tad. Just OCD I think.