The leather in the M2 is coated, so a damp towel followed by a dry one is sufficient to get the seats clean. I would not recommend any products at this point or you risk stripping the coating. Same goes for the steering wheel.
I use a small toothbrush on the raw carbon fiber. For the alcantara get an interior brush and be gentle with it damp (be careful not to wet the alcantara too much).
To note: if alcantara gets stained or very dirty, there are ways to clean it but too long to post here - I would recommend watching some videos.
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