I was so pleased when this Katniss navy blue vanity arrived.  It was pretty and unusual and perfect for our little powder room as part of our house remodel.  I checked it carefully and there was nothing visibly wrong with it.  But only three weeks after it has been installed by our builder and the faucets also, the mirror inserts have deteriorated.  Ugly brown patches have appeared on two panes, and are getting bigger.  It seems that the coating on the back of the mirrors is disintegrating.   I am very upset, because how am I supposed to fix it without a lot of hassle and cost?  Take out the whole vanity and the plumbing?  Our powder room is not damp so that's not the cause.  The cause is shoddy workmanship in my view.  I hope Wayfair will come up with some suggestions.