Cleaning a ceiling is never easy or enjoyable. Keeping your arms above your head is quickly tiring. To speed things up, close the openings of the room you intend to wash off the ceiling and transform it into a steam room. The ideal is to plug a kettle into the room and come back later: the ceiling will not be cleaned by itself, but the work will be greatly facilitated.
Be careful though, some coatings (wallpaper) do not appreciate the humidity.Suggest a tip for this theme