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I think a lot of that it just old and mucky as opposed to mouldy.
https://www.screwfix.com/p/no-nonsense-upvc-cleaner-1ltr/86575
Or just hot soapy water, a paint brush to get into the corners and microfiber cloth should have the frames looking much cleaner.
A sharp scraper should take off the old sealant. The quarter round beading along the sill will probably pull away with the scraper behind it, which would make prepping the sill easier.Reseal any sections on the outside where the silicone has split or coming away.
I wouldn't bother trying to take the glass out unless you need to replace the double glazed unit.
Being as they are glazed from the outside, I'd expect the beads to be security locking.
Where you remove the internal wedge gasket, push the glass inwards which allows the beads to unlock. Being as there's no wedge gasket visible between the glass and inner frame, your glass is retained with double sided security tape.
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user69121
Yeah at time of buying couldn’t justify having a gun. Trying to weigh up the future use but I might as well get one now.
The strips look like a good idea. No mess neither. I assume you cut to length and stuff in gap?
Here are some pictures (excuse the poor finish of my lining
You can see the black mould - so at the moment I’m trying to elimate issues with the windows. Downstairs bay is much worst is terms of area of cover. But upstairs could do with taking out and insulating so another project to do on my list. Plus the double glazing is probably quite old. There’s no trickle vents on them and some of the vent for the chimney was wallpapered over which I’ve opened up and fitted a vent cover.