I've had good success with Dodo Juice Supernatural Leather Cleaner. Definitely leaves a matte finish.
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2021 MBB M5C (retired) 2018 Daytona Violet M3 ZCP (retired), 2016 AW 550i (retired)
2013 EBII 335i (retired), 2008 Platinum Bronze 535xi (retired), 2007 Monaco Blue 335i (retired)
1999 Hellrot M3 coupe (retired)