^True. May local and imported mirror. Hindi ko lang alam kung paano malalaman difference. According to google, mahirap i-repair yung black spots sa mirror. Some articles suggested na ipa-re-silver (the back part) pero costly siya and if naka-fixed na siya sa wall as splashback, mahirap na ata alisin yun. All you can do is prevent it. Google mo sis, madami din suggestions on how to prevent the black spots. Pero naisip ko, instead of fixing the mirror by using adhesive, why not use glass metal studs? At least madali tanggalin, yun nga lang makikita mo yung metal studs.