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Have a look at some videos about Dryflex from repair care. It's possible to only remove the loose stuff but often it isn't all as loose as it seems, there are stubborn areas. Sometime the putty has fallen out of the back of the glass, then it's best too get the whole pane out, it opens a bit of a can of worms regarding painting inside and out though.
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Oiled and weather permitting will be painted tomorrow. Putty didn't turn out too bad after all. Had to replace a rusty hinge as well (not something you need to worry about with sash windows but likely they will have some other unforeseen issues) and the screws snapped in the frame. Luckily a friend with a drill press was able to help me drill new holes. We'll see if the two screws are enough, otherwise it's new window time I think.
I've done a few grade 2 listed and I do some total restorations. I will admit I'm a bit of an outlier though. If you have a lot to do and you are thinking of doing it yourself then buy a speed heater cobra. You can find plenty of videos on how it works. You'll be well advised to buy into the repair care system as well. Again plenty of video resources.
It's not even a fun job when you are well prepared for it but it's a total bitch if you're not. :)