We recently hired a wonderful new cleaning crew to scrub down the play structure in our back yard. They swept and washed every inch of it from the slides, to the rock walls, to the stools and other accessories.
They don't do windows, but fortunately the only actual window in the structure is the plastic sky light.
Both girls were very professional and even dressed in matching "uniforms" before beginning work. The best part was that the entire cleaning job was their idea in the first place!
The play structure looked great for about a week before a bad storm blew it over and it got covered in mud and bugs. I guess we'll just have to see if they are available to come clean it again for us on the next sunny day!