Is there a benefit in getting in there and scrubbing or just a powerwash is the better way? I know some connectors may not like anything extreme.
I've never had any issues with pressure washing this truck, but mind you I use a lot of degreaser and have since the truck was new to keep most of the grime to a minimum, I DO NOT spray really close to anything with the wand at the car wash. This last time was so easy to clean as I had previously removed all engine components only a few months ago and detailed the whole engine compartment. I used just regular car wash soap and water in a bucket and a soft brush to clean it and only used the garden hose to rinse off this time around.
edit: It really isn't that hard to remove the headlights, battery (tray), intake and air filter box, if you cleaned all of those individually, there is easy access to everything else and a lot easier to keep clean afterwards. I took the inner fenders and flares off and really went to town a few months back, it was really rewarding for my OCD. SOme people mocked me for it , lol, don't care ha ha. It's too easy to clean now.