For single pane windows this works.
I moved into an apartment in a very old house recently and all of the windows are single pane with storm windows and they were FILTHY.  Since none of the windows are able to be tilted back to be cleaned I wasn't sure what I was going to do and heard mixed things about magnetic cleaners. Well, for me it has worked great but I understand the mixed reviews. If you have thick windows or double paned I do not think this will work. The magnet is decently strong but even I've had it fall away a few times. Basically, the thinner the window, the better result you will have. Get the window and the pad nice and wet with cleaner, give it a few passes and then squeegee up and down slowly. Magnet could be a bit stronger, but it does work if you don't wipe too quickly.
Rating: 4 stars