There is a button that looks like a demister on the dash beside the VDC button that I have no idea what it does. There is already demister buttons else ware in the car so it must be something different.
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The Subaru Legacy owner's manual indicates that button is your windshield wiper deicer. Pictured below is part of page 3-38 of the manual. The manual explains how to use the deicer in this picture.