Anyone have any good suggestions on how to clean the plenum and runners while on the car?

Thanks guys

 

Try an engine cleaner... if that doesn't work use a stainless steel wire brush or in extreme cases Eagle 1 Rough cast aluminum wheel cleaner... The wheel cleaner will attack the plastics and metals, be sure to wash it all off completely after about 30 seconds. Anythign it touches may turn white, but it'll get the runners and plenum cleaner than anything else out there.

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