
Overall cleanliness goes a long way in the appreciation of the vehicle.
It makes it much easier for you, or your mechanic (or your buddy who pretends to be a mechanic on the weekends) to find things like oil leaks, etc.
The impression it gives if you decide to sell your vehicle says a lot to a potential buyer about the perceived upkeep. Think about it, two identical cars, one with a clean engine compartment, and the other with grease and grime all over in it... which are you buying?
Kelly Blue Book & Edmonds both place a premium on a clean engine compartment!
AutoTrader has stated that there is roughly a 200% return on investment when selling your vehicle with a clean vehicle, and a clean engine compartment reassures buyers!
When you check your fluids, and do anything with your engine, you will appreciate having something clean to look at rather than years of grease, dirt, and grime.

Engine Covers • Plastics • Accessible Surfaces • Surrounding Areas

Underside of the Hood • Edges • Cowl Area • Accessible Components

Covers • Plastics • Hoses • Dipsticks • Caps • Accessible Components • Hard-to-Reach Areas