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I don't know shit about how mirrors are attached in cars, but I know how to Google. http://solutions.3m.com/wps/portal/3M/en_EU/Industrial-Adhesives-Tapes/-/So

• userbinator 8y ago
  This is the relevant line from that link: 3) 3M Double Coated Tape 4492 is used to bond interior visor mirror glass to the plastic bezel. To the grandparent: Your Audi likely uses double-sided tape too. :-)