I use an 65' ionics donkey with a goose neck on, I got this reasonably cheap an needed it for a job in liverpool city centre, reason being it really sturdy and under the windows on 2nd 3rd an 4th floor there is a concrete sill about 12" deep, when cleaning you can't see the bottom of any windows so it's a case of whacking the concrete sill until you get it done. Bit rough I no but gets the job done.
I wouldn't be happy doing this with some of the guys poles off here tho, I only been wfp for last year, 18 months so have never invested in the "gardiner range" just yet and most my work is trad.