And repeat for the top half of the window

And then hang in the window - not letting it gather in a heap at the bottom - so air can squeeze under/around it (and be cooled in the process)

Twist it to ring it or until not dripping (or not very much anyway)

Cover it in water

I'm less scientific than Ailbhe, and have more arm strength available. So I just roll the towel into a sausage

Well, it took 5 years, but it finally got me...

And this is why we have the nuclear block on this social network...