Best cleaner for plastic engine parts?

[buster]

I prefer SimpleGreen and use 303 for cosmetic protection!! lol

 

[tweeker43]

i use s100 spray on my bike and decided to try it on my car engine. spray on, let it sit, rinse off.

it worked quite well. be sure that your engine is cool or cold. no more than backing it out of the garage...

once i'm done with that i either wipe down the engine compartment with eagle one waud or mother's back to black. (sometimes both...)

 

[mburnickas]

I use Chemical Guys Liq Ex shine or there GEL. Works mint!