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A drill and some kind of synthetic spun plastic like a scotchbrite pad rammed in there.
Or just buy a karcher window vac.What’s the plan long term? New windows? Triple glazing and condensation will disappear apart from the odd day you get it on the outside.
At some point I’m making some trickle vents for my critall windows to fill the original letterbox sized ones, no idea what was there before but there is foam pipe lagging jammed in for now, going to use spun synthetic matting from an industrial floor polisher cut to size and then make a screen from decorative brass mesh bordered with folded brass shim but not starting on that for a while.
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(edit - single glazed!) aluminium windows.
could be an up hill struggle, trickle vents work well for air flow in very well insulated buildings (I've also known them as an excellent breeding ground for 50+ harlequin ladybirds or spiders). Fixed interior second glazing maybe an effective option to weigh up with all the cruxes
This may not be a DIY question but we've just moved into a gaff with (edit - single glazed!) aluminium windows. They have no trickle vents and the condensation in the morning if we've had the windows closed is crazy - it's like it's raining on the inside. There are some vents in some rooms, but they don't seem to make much difference.
I only noticed this this morning as it's started to get colder, and obviously shorter term we'll try to keep windows open as much as possible, but longer term is there anything I can do here? Is it possible to retrofit trickle vents onto aluminum windows?