Isopropyl alcohol will remove the airbag warning stickers on vinyl visors (can't vouch for leather if you have full leather). You can either remove the visors (couple of T20 Torx screws) or lay an isopropyl alcohol-soaked paper towel on top of the visors for a few minutes. Then start peeling off. Goo Gone or Goof Off should remove any residue. It may leave an outline where the sticker is, but far less noticeable than the warning stickers.
This worked on my wife's 2011 335is Coupe when it was brand new.
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The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
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