Double Glazing Unit Repair If You have double-glazed windows that appears misty or cloudy and cannot be cleaned it's probably "blown". This occurs when the gap between the panes of glass expands due to the deterioration of the window seals. It is much cheaper to replace the double-glazed unit than http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1196641