Find a neighbor with a huge SUV and surprise them by actually putting it to good use: Hitch it up to the mirror and let it pull the damn thing off...

Well, maybe that's a bit extreme, but that's about what it took to get mine out the other day. It's held in the bracket by some sort of spring-loaded clips and you're supposed to be able to pull it out (maybe with a little twisting, or you can try pulling to one side or pushing to one side and pulling straight down).

Mine refused to budge; I sat on the armrest and pulled harder and harder and then all of a sudden I was in the back seat... holding the mirror, complete with mounting bracket with three screws poking out. Oops.

It ended up requiring two screwdrivers working from the INSIDE of the bracket to snap the mirror stem out of the bracket, what a major pain in the butt. Maybe the spring gets stiff over time?

Good luck!

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)