Two weeks ago I acquired an umbrella clotheline. I added wooden clothespins from the dollar store. I have it in my patio umbrella stand.
Ooops. Technical difficulties. Windy.
I'll have to figure out a way to secure it in the yard. I don't want to pour a permanent concrete foundation for it. For now, I tied it the the birdfeeder post at the corner of the patio.
edit: It took about 1 hour for the towels to dry in 85F, full sun, and a breeze.