Double Glazing Unit Repair Double Glazing that is hazy or cloudy and cannot be cleaned has most likely been "blown". This occurs when the gap between the panes of glass is widened due to the degrading of the window seals. Replacing the gasket seals on your windows can fix this https://simon-lundberg.technetbloggers.de/why-double-glazing-glass-replacement-near-me-is-harder-than-you-think/