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Double Glazing Unit Repair Double glazing that is hazy or cloudy, or that is not able to be cleaned has likely been "blown". This happens when the gap between the panes of glass opens up due to deterioration of the window seals. Replacing the gasket seals on your windows will correct this issue and is cheaper than replacing the entire double-glazed unit. Seals The window seal, also called the window gasket is responsible for sealing air in between the two panes of glass in your double glazing. This preven