The plastic parts for the intake should be designed to survive gas and oil and are pretty chemically resistant. Something like a tub of simple green degreaser in warm water should be fine. Just make sure it's good and dry before assembling it. Do be careful as simple green will etch/discolor any shiny aluminum pieces.

No built in sensors that I can recall. The throttle body and CCV valve unbolt and that would improve access to clean the inside

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles