When is the last time you cleaned your windows? I have to be honest that it has been almost a year since I cleaned ours! I do hate cleaning windows as it takes a long time to do properly. Firstly, you have to wash it with warm soapy water, then wipe the water away and finish by using a dry cloth to make sure there is no water mark left on the window. In the end, I will end up with 2 buckets of water, 2 cloths and maybe a paper towel!