On 17 Apr, 09:47, Stuart Noble
wrote:
The "faint film" you're getting is also condensation but, unless it's
between the 2 panes, there's probably nothing wrong with the units. If
it's only just started, it may be to do with the strange weather we're
having. I'd reserve judgment until that wind gets back to SW and brings
us some warm stuff

If my experience is anything to go by, it is not condensation per se,
but the result of condensation causing salts to be leeched from the
glass, leaving a cloudy film. This film cannot be removed (at least,
not easily) even after getting access to the inside pane. My
understanding is that this is not uncommon with any double glazing
that is not truly hermetically sealed, and such units commonly have a
life of around 15 years before this clouding starts to happen -
although I have some units over 25 years old that are still clear.

crb