Recently moved into a house with a garden (having always been in flats and drying clothes indoors). I'd quite like an unobstructive way of drying clothes outdoors. There's nothing in the garden at the moment, its all flat but has a tree. Rather than having a rotary airer, I quite like the idea of a retractable washing line/ tying a bit of rope from the tree to somewhere else - but where?! there's nothing I can easily tie it to. Any suggestions?