engine bay cleaning

So I got a bit messy this weekend. Wondering what the best way to clean the engine bay is? Any tips are much appreciated. Googled it and some sites say yes, some say no, some say cover specific parts. Figured others on this form have definitely had to have run into this at some point.

Hi all, Recently took the JL off road, ran into a few mud obsticles and just couldn't help myself. My engine bay is now straight up brown. No black in sight. That being said, I was wondering if anyone has made or seen a diagram to help show where to avoid spraying when pressure washing under...