This is the first one I made Mk1, Just strap it to the end of any pole and leave an old brush on.
This is How its controlled, but if your up a ladder its better if someone can do the pumping for you.
This is the end I have on there now, with a picture of the pressure bottle you can buy from Focus, its called a Flower Shower.
Close up view of how I fitted it to the end of my pole.