Once you've freed them off, remember to fold them in & out regularly to stop it happening again.
As for freeing them off in the first place, my method was to give them a good spraying in penetrating fluid, then cover with a thick towel and a give them a swift kick like you were trying to boot someone's door in, roughly in the direction the mirror wants to fold in on. It'll either break the bond between the ally parts or simply snap the mirror clean off, in which case you'll have to replace it. If you do free them off, and I mostly got lucky with them, then give them another good spraying while you work the mirror in & out over and over to clear out all the remaining allyoxide.
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