they are all sealed units the windows below them some of them open each window is about 2 an a half ft wide buy about 4 an a half tall there is about
25 along the front and about 10 down each side,wagga you make that look easy you must have had some practise at that lol
if they are dirty first clean pole and straight pulls or learn a wagtail quickly, and you can carry a microfibre floor mop on a pole and finish with that to cover all the mistakes and then after that microfibre floor mop, dont waste money on fancy kit all you are doing is removing dust, every now and then keep your eyes on the glass and if needed soap and pole again