Cleaning engine and engine bay

[AirSpeed]

I painted my truck two years ago but didn't paint under the hood. I have some chrome on the engine but it looks like crap with the brown firewall and grime all over. My engine is fairly clean now, it doesn't leak all over so I want to clean it all up and spray some black on the firwall. What is good to use that won't keep paint from sticking? I've tried different types of engine cleaners but they all seem to leave a film that keeps the paint from sticking. I recently used some Super Clean on another project but that stuff actually removes paint, it works great on oil but i would hate to get any on my paint by accident. I'm not looking for show quality under the hood, I just want to clean it up. Thanks for any suggestions!
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