[Kajtek1]

Before you try to improve MB design, consider that the ca 50 engineers did the design for a reason. It might have some side effects, like gunk accumulation, but flaps help in engine performance.
For this year Liqui Moly makes intake cleaner, who in easy job should eliminate the problem where is started, so some might try to go this way.
https://www.napaonline.com will find you
Part # : AIC LM20208 what is the cleaner , although NAPA is screwing around with its availability. Call your local NAPA and ask them to order it.
Raise the hell if they don't.

 

[Kajtek1]

Barefoot on greasy concrete slab?
Observe the job safety