I have recently bought this window cleaner as I was having such difficulties cleaning the windows because of my hands.
Every good comment they say about this item is true, it's absolutely fantastic, and makes cleaning windows a joy!!!!
First a wet cloth with a little washing up liquid on, wipe over the window then use the cleaner - no streaks, no residue, no need to polish off.
It's done in seconds. I then use a general purpose cloth just to wipe the window ledges down. I complete a large bay window in less than 10 mins.
Also now there's usually some condensation on the bedroom window in the mornings, two minutes and it's all gone - again this is a large bay window.
Money very well spent. If you're having trouble it's worth considering.
http://www.amazon.co.uk/...ords=karcher+window+vac
Gogs