Its from your shorts with metal rear pocket buttons. Have this on my car also. And previous car. Mine was from unsnapped metal button on rear of shorts. Was pissed because i knew of the problem a year ago, but forgot. Threw shorts in garbage.
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Garage
2014 Z4 35is RIP /2016 Z4 28i RIP
2015 335i RIP
2016 Audi A7 RIP / 19 Genesis G80 RIP
2020 Z4 M40i / 2022 X3
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