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I always use Carb and Choke cleaner, its eats anything that has oil on it in a second.

when I did my whole engine when I first got my NSX it hadnt been cleaned in years, it took me 4 Bottles to clean every thing.

 

now that my engine is spotless I use maybe 1/4 a can. every few months

 

I usually do it while the engine is still warm, and the oil is wet.

 

now after you do it your o2 sensor might come on intill the stuff burns off. but will go away soon.

then I use any tire shine for everything. I dont use the foaming crap the hand spray kind only.

 

then wipe off the excess and the engine looks like new.

 

I know some on prime will say never do what I suggest but its worked for me 10-12 years all kinda of cars. never an issue.