Cleaning upstairs outward opening windows?!

[Jamjar12]

I wonder if anyone has any suggestions to help please!

Our windows open outwards and I can't reach the whole window to clean it normally. We have a conservatory directly below so can't access using a ladder or anything downstairs. Does anyone else have the same problem? Is there some amazing cleaning tool that works? I'm not even sure how a window cleaner would be able to do it as we have a very small walled garden outside the conservatory so there's not much room to manoeuvre!

[LIZS]

You can get extendible brush and sponge/wipers from places like Robert Dyas. Alternatively when fully open is the gap at the hinge dude wide enough to get a sponge/wiper through?