Condensation(?) in double glazing


Hi all,
My double glazed back door window has become almost opaque in places due to build up of a milky residue between the panes of glass. Any hints on what to do about that?? :)
Thanks,
Peter.
PS. Thanks to those who responded in my "Stuck stop tap" thread. Applying a judicious amount of heat sort it out :)
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Peter Spikings wrote:

Is it a residue, or is it condensation? (if the latter, a little heat in one area, say from a hair drier, will clear that bit).
Condensation is a problem in sealed units and not easily fixed. I've got it in one of mine, and I don't know a solution short of replacing the whole darn thing.
Andy
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Andy Champ wrote:

OK... There's a bit of condensation and over the years it appears to have left the residue. I'll try a hair dryer....
What I'm curious about is that the condensation is surely pure water so why does it leave a residue?
Thanks,
Peter.
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Peter Spikings wrote:

I should make myself clear.
The hairdrier will clear a little patch, and let you tell it's condensation. The mist will then recondense somewhere else inside the unit, so it isn't a fix.
Andy
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Andy Champ wrote:

Ah OK. Oh well!
Thanks for the help everyone.
Peter.
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This is typical of the edge seal failure. The only cure for this is complete window replacement but this time replace it with one which has a well designed edge seal. This often used to occur with edge strips called "swiggle strips" which were plastic and allowed movement and therefore leaks.
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The seal has gone so the unit will need replacing, Contact a good double glazing firm.
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