I put my visors down to hold my windshield shade....  My pass side the vanity mirror is loose and messy gooey black glue foam rubber gunk holding the mirror in the visor melted and was falling out..... nasty stuff .... cleans off the upholstery with rubbing alcohol luckily

 

Pulled the visor off and tried to vacuum the dissolving gooey stuff..... Might have to just break the mirror glass to get all the messy goo out of there.

 

Anyone else had this happen

 

Yeah, been a while though. I think I just slid the glass as far as I could and squeezed somethingin there, maybe rtv can't remember and then slid mirror back, closed the visor till next day. So far been good, I actually forgot I did this till I read your post. 

mine is the same, but noone ever uses it...