I have heard this too, it is supposed to be a cure for misting on the glass
inside sealed double glazing. The 'doing something' I have heard of is
drilling one or two holes in the glass, sucking the air out with a vacuum
cleaner, then sealing the holes with rubber plugs. Even if the holes could
be drilled without breaking the glass the air sucked in would contain
moisture and the problem of condensation will remain. Presumably you would
need a diamond-tipped drill bit or similar to drill through glass. My
understanding is that the only cure for misting double glazing is new
replacement sealed units which will have been filled with dry air or a dry
gas such as argon, just like the original units.
plastercine/blu-tac to make a "cup" to hold lubricating oil) top and bottom
of glass in the summer which after a while did the trick in. Sealed with
silicone. Didn't work in my lounge as the condensation had gone green and
didn't get too much sun to dry it. In the end new units all round cured it.
How to do it using a fish air pump here:-
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