This might be more DIY than housekeeping, I am not sure. I have been cleaning my windows (and using a tip on mould on window frames got here). I noticed my bedroom windows seemed to have streak marks running down them. Tried to clean off twice. Then went outside in case they were outside. But they are not. It seems as if these marks ,which I cant quite describe but look like water or soapy marks and are running down the glass leaving it milky coloured and seem to be inside the double glazing ( between the two layers of glass).
Can anyone tell me what it is, and what I can do to remove it?