...and get a WFP (if you haven't got one) and that job will be brilliant.
Wouldn't be too sure of that Tosh...
It's got "stone frames" if you know what I mean.
They're porous unlike UPVC or painted wood, and they often leak dirty water down the glass.
I've got a nursery like that, and I try not to clean the top of the glass for that reason.
Ask Ian about the Almshouses by the Five Alls...they're a pig to do and they run sandy water like mad, but they're really old folk with net curtains and he gets away with it.