Oh boy. Try nail polish remover in a spot. It's basically acetone with some oils and conditioners mixed in.
Then give everything a good cleaning with your fav interior cleaner.
Then destroy all permanent markers within a 1/2 mile radius.
I hate to ask, but do you have a pic? I know that's morbid but have never seen anything like what you describe.
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2004 E46 ///M3 SMG Convertible Carbon Blk\Imola
2017 LBB ///M2 DCT
2013 Porsche Boxster S
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