Years ago in the London Newspaper Group classifieds there was an ad with the title "Window Cleaning Service". I was tempted to ring but by the time I got round to thinking seriously about it the ad had disappeared.
I remember (years ago, again) visiting a woman who lived on one of the upper floors of an old house. No curtains in the windows, the bed was a bunk bed, and she insisted we perform on the top deck. I'm sure that she had some kind of deal with the people in the house opposite, but it was too far away to see.