Damn Im jealous. I just took mine this weekend to the car wash and washed the engine bay. I put it on the soak mode for low water pressure and spray the motor while its running. First note, I started the truck and drove straight to the car wash, turned her off and sat there for a bit. Temps were about 150. Then I turned the truck on and soaked the engine bay. Then I rinsed without squeezing the handle for extra pressure.
Begining of the year I used a soap bucket with a rag and wiped everything down in the engine bay, then used the garden hose fer a rinse. The car wash is a quick dust off. Need to take pics. First I thought you had to use some type of dressing, but you dont, it shines nicely without anything.