Can I please add to this query? Who owns the fly screens – the owner or the OC? I’m a tenant in a fourth floor building in Sydney and I would like to clean my windows and think I could do it by, relatively safely, hanging out the window to clean the other window panel but the fly screens are so old I think I’d damage them by trying to remove them. I’ve lived in this place for almost three years and the windows have never been cleaned and they are filthy so I assumed it was the owner/tenant responsibility. I have an overseas landlord and it takes months to get anything fixed so I’m reluctant to test the stability of the fly screen frames!