Double Glazing Unit Repair If You have double-glazed windows that appears misty or cloudy and cannot be cleaned it has probably been "blown". This happens when the seals on the windows break and the gap between the panes of glass expands. It is cheaper to replace the double-glazed unit rather http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1203487