No, Fairy is tops. I think most window cleaners go through a 'what will I put in my bucket?' stage, but I'm sure 95% of us end up reverting back to the good old green stuff.
It cleans a window and provides slip.
Don't use too much and add it after you've filled the bucket with water.
At 88p a bottle and available from every supermarket in the country, you can't go far wrong with it.