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Condensation, repair of seals in double glazed windows?

10 dooble glazed windows have condensation, what causes seals to go and how do you repair them at a minimum cost?
Leonine Seahorse, December 2009
i have just been looking on 'the window man' web page , it says the only way to remedy failed sealed units is to replace them :(

amberrosejade, December 2009