Check out this video from Karcher, which shows the new window vacuum WV50. The Karcher Window Vacuum is ideal for windows and other smooth surfaces. Tiles, glass furniture, windows and mirrors all come up beautifully. The demo video shows exactly what is possible. The WV50 is available from alexshanks.com.
[youtube http://www.youtube.com/watch?v=ToSESH8mkt4?rel=0]