Windows Cleaning ... house faces East/West and so the windows look
grubby for at least half the day.

Are the 'extension pole' window cleaning systems any good?

Could hire a window cleaner, but that's not in the spirit of DIY!

I don't really fancy getting a ladder as they do tend to wobble a
bit... although if a non-wobble ladder was available I'd be ok.

Oh, and any ideas where to get such a cleaning system and rough costs?

Have uPVC throughout being able to sponge the sills would be a bonus.

Many thanks.
Steve