I use 100% purified water-fed poles, with specially designed soft brushes to clean -
Windows - Fascias - Gutters - Shop fronts - Signs
The advantages are:
1) Pure water dries clean, leaving windows streak-free, with no chemical residue.
2) I can reach up to 60 feet high without the use of ladders - extremely safe!
3) Frames are cleaned at the same time as the windows.
4) Maintains your privacy - all windows are cleaned from the ground.