I would love to hear feedback from an expert but one important (and upsetting) tip/experience I have is this.
DO NOT use any sort of silicon-based product on any sort of "soft touch" plastic. I went to a car wash that TOTALLY coated the "soft touch" – of my VW with some sort of armor all type product and it ruined it for life. It went from having a nice, semi-firm matte finish to looking like some old plasticky vinyl dash from a 1970s Japanese import car. And – to be clear – this was not until it "wore off" – this was for the rest of the life of my car.... a permanent mistake.
A friend of mine actually recently bought a 300 C and I warned him of this and he went online and found a product but the standard tip I believe is to just use a damn (lightly damp) microfiber cloth to wipe clean and another microfiber to dry/dust off with.
I would be VERY cautious of taking it into a car wash place and just ending over the keys and trusting they know what to put on that material to clean.
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