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Have you tried cleaning it with something? I’ve heard baby wipes do a good job.
first thing I did when I got my car home was coat the seats. No issues so far.
Mine did it and tesla gave me the finger said it was normal. So I ordered the rear seat belt hole off Etsy they have helped but still have my black marks on the seats. When I picked up the car they were fasend on both rear seats and never unbuckled them for almost a year. Good luck with tesla service. My SC sucks.