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How can I get a rear view mirror button off the windshield if it was put on upside down?

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I found these instructions on eHow:

  1. Use the blow dryer or heat gun to warm the mirror mount right where it attaches to the windshield. You are applying this heat to soften the adhesive underneath.
  2. Test the mirror every so often while you are heating it by trying to gently move the mirror slightly back and forth. Once you feel movement, continue to apply heat and increase the force a little at a time. Work the mirror back and forth and it will release from the windshield, leaving a fair amount of adhesive behind.
  3. Warm the adhesive left on the windshield again. For thick patches of adhesive, wrap the fishing line around your fingers as if you were getting ready to use dental floss and press your fingers up tight against the windshield on either side of the remaining adhesive. Work the line under the top edge, and move the line back and forth with downward pressure. The line will cut through the adhesive and remove all but a little residue.
  4. Apply the adhesive remover to the residue and use the razor scraper to gently scrape off the rest of the adhesive. Wipe the area with a rag and more adhesive remover.
  5. Clean the area with glass cleaner.

These look fairly comprehensive. You may want to put the mirror on the mount, even though it's upside down, so as to have something to hold on to. Do not apply too much force to it, though, as you run the risk of breaking it. Also, ensure you remove all of the glue off of the mount, as new glue will not want to stick to it if you don't.

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This sort of answer seems common to all adhesive removal (except for the razor part). Do we need an adhesive tag (or something like it)? – Bob Cross Jul 27 '14 at 19:55

Applying heat to one side, interior, of a vehicles windscreen runs the very real risk of cracking the windscreen, because of the differances in expansion. The more usual way to remove a stuck on mirror is too use a length of wire. Introduce the wire under one corner of the mirror and pull it side to side to cut through the adhesive and any patch used. Finish off by cleaning off any residue adhesive. This is the same method used by professional outfits to remove whole bonded windscreens when they are too be re-used. Using heat is is a very risky business unless you are able to control the temperature of the whole screen and should only be considered as alast resort.

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They actually sell a debonding agent just for that very purpose. As I recall, it sprays on & wicks under the button, releasing the button.

But... the SIMPLE thing to do, and least worrisome, is to get another button and stick it directly to the one that's already in there... only right-side-up this time. Nobody will ever notice that you have two buttons, one stuck atop the other. I've watched a good mechanic do that in a Porsche dealership.

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I tried doing the above - applying new button on top of one installed incorrectly, and it just fell right off when I put the mirror on. Maybe a temporary solution and it might work for longer than it did for me but park it in the sun on a hot day and it'll slide right off. – user7500 Nov 13 '14 at 19:59
Did you clean the back of the previous button thoroughly before glueing the new one onto it? It (like the windshield) needs to be absolutely sparkly squeaky impeccably clean or it won't take glue right. I've seen double-button mirrors that lasted for years in off-roading trucks. – TDHofstetter Sep 5 '15 at 22:36

I was able to get mine off using floss. It fits into the gap between the windshield and the glued on metal button better than wire. You have to keep at it and use several pieces of floss since the floss will break. It took me about 10 minutes. Floss is thinner than most wires and fits into the narrow gap well.

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The wrench trick did it for me. Carefully applied pressure with a long handled wrench and just when I thought it wasn't going to work-pop! No damage to the glass, either. The hardest part was finding the button after it popped off. It ended up under the passenger side seat almost under the rails.

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This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – Rory Alsop Jun 25 at 15:47

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