Mine ain't perfect but I was recently in the same situation as yourself... To scared to clean it... Anyways talked to some guys on what to use an how to do it and I can say I love doing it now!
I cover my:
air filter(cold air intake)
Then I use a degreaser spray and spray over the whole engine bay...
Let it sit an soak for a few mins..
I rinse with a power washer if possible, if not a hose works just fine! (Obviously don't sit there an drown ur engine with water but just enough to rinse off the degreaser and such...
Then I use a wheel wet ( the oil based ones ) for the rubber hoses to keep the moist and prevent them from cracking....
And then use a back to black product to keep all the plastic looking clean an new!
Make sure to clean ur cold air intake filter too makes a big difference
anyways that's how I get her done![ATTACH]1521