Yup this is on my "to-do" list very soon. My car too was unloved and the engine compartment is very dirty. I just completed re-sealing the breather vent covers as PIZZYGUY suggested. I took a rag to the heaviest places I could reach by hand and I have bought a can of spray cleaner I plan to spray all over the motor then hose it down. I plan to cover the opening for the air intake, alternater, battery. I want to do it at home with my own pressure washer as it has less pressure than a commercial car wash sprayer. Then again, maybe just a good garden hose sprayer like suggested my do the trick. Look up some videos on YouTube for power washing car motors. It can be done safely.