We used to do this in the City of London, I could really have done with a bit kit like that at the time, must say it looks impressive, like a fool we gave up the blind cleaning as it was a real pain and never went back to it, perhaps we should.
If you don't mind me asking, you went to a hell of a lot of trouble and expense, yet say you didn't use it, was it that you could not get the work for it.