The best advice is to clean it regularly so it never gets really dirty. If you do that, you'll only need a damp cloth (possibly a little soapy water) to take off any accumulation and you'll be set.
Don't let it go and you won't have to work hard to clean it up
I wish I had done that years ago. That's the way to go. I've used Sray Nine. It's alright, but not great. My engine isn't filthy, but I wish I would have keep it clean like any other part on my Celica from day one. Makes it easier and always clean.
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