hmm, liquid eh?
When researching this issue I came across older BMW's which leaked fluid from the interior rear view mirror damaging shifters and consoles.
A member here (dandanio) switched to European mirrors and I wonder if these were self dimming? thread hear:
http://x3.xbimmers.com/forums/showthread.php?t=585138
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2013, AW, xDrive35i, M Sport
Package, Technology
Package, Dynamic Comfort
Package, Premium
Package, 3M Clear Bra, Euro foglight switch, a few coded fixes