Do any Mumsnetters have some kind of trick or hack that I've missed (after 50 odd adult years on this planet) to get my windows clean? I thought I had cleaned them adequately last week. The sun is out and they look as though a three year old has been doing it. Totally smeared. I have a Karcher. Do I need to do both sides of each pane? Finish with a chamois? Posting here for traffic.. please help!