How to reattach a rear view mirror on 2009 Audi A6

The piece that is on the glass is glued on with an ultra violet cured adhesive, or a two part epoxy adhesive. The last one I did was cured by the sun in 24 hours (mix, set and cure).

https://www.youtube.com/watch?v=8IBp0Pkoa24

Gluing it back on

https://www.google.com/search?q=fixing+rear+view+mirror+mounting+plate

Permatex® Rear-view Mirror Repair Kit - Canadian Tire

https://www.canadiantire.ca > ... > Interior Car Mirrors
Jan 23, 2022 - Permatex® Rear-view Mirror Repair Kit contains everything required for making professional quality repairs in just minutes Two part adhesive ...
Mount Style: Adhesive
Assembled Weight (kg): 1.00 kg
Assembled Weight (lb): 2.20 lb
Assembled Width (mm): 10.00 mm Rating: 3.3 · ‎$6.49

How to Fix a Rearview Mirror - NAPA Know How Blog

https://knowhow.napaonline.com > how-to-fix-a-rearvi...
Jul 30, 2020 - Most rearview mirror repair kits only come with the glue components, some come with a replacement metal glue-on tab, but you still need a couple ...

Permatex® Rearview Mirror Adhesive Kit

https://www.permatex.com > products > permatex-rearv...
Permatex's Rearview Mirror Adhesive contains everything required for making professional quality repairs in just minutes. This repair kit includes ...

Rearview Mirror Repair Kit - Princess Auto

https://www.princessauto.com > product
Home · Auto Repair · Chemicals, Adhesives and Lubricants · Adhesives and Sealants · Instant Adhesives; Rearview Mirror Repair Kit.

There are 3 common ways to fix a windscreen mirror. Glue, 'grub' screw or clip. Check to see if yours has a tiny screw on the mirror that needs winding out. If no screw it is possibly a spring clip mount.
BE CAREFUL, If you are too rough you will shatter the windscreen and they are NOT cheap.
Hold the mirror arm flat against the glass above the windscreen mount. It should slide over the glass mount. The clip is a strong spring so it will be a tight fit. Try using a strap and pull down flat against the windscreen. it might resist then suddenly snap into place so Be Careful.

You can reattach your mirror with glue you can get at almost any Auto repair or parts store.

If the rear view mirror mount has seperated from the windshield you can buy the glue kit at most auto parts stores. Any windshield installation company will also install it for a small fee.

another way it might attach is with a small metal or plastic wedge and glue maybe fashion the wedge from milk jug cap and a dab of 5 min epoxy firmly hold the mirror in place until it stays

The mount for the mirror can't be removed, if you attempt to pry it off you will crack the windshield

it should jsut click back in, if not you can always take it off and pop it backtogather and glue it back to the windscreen

Order from the dealer the kit, you are right no epoxy will hold the mirror on.

the mirror should simply slide over the metal mount (button) that is glued to the window.

loosen the set screw on the mirror mount...

hold the rear view mirror mount on the glass just above the metal mount (wide end of plastic opening facing down)

slide it into place...
secure it by tightening down set screw you loosened earlier.

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there is a small alan screw in the base of the backup mirror. loose it and slide the mirror back on to teh base on the windshield and tighten down the alan screw.