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Double Glazing Unit Repair If you have double glazing that appears misty or cloudy and can't be wiped clean it's likely to have been "blown". This occurs when the seals on the windows break and the gap between the glass panes expands. Replacing the gasket seals on your windows will fix this and it is far cheaper than replacing the whole double glazed unit. Seals The window seal (also known as the gasket for windows) is responsible for sealing the air between the two panes of your double-glazed windows