wish we still had an outdoor shower---'course it would be kind of scandalous since the middle school behind my house raised their track up so dang high that people can peek right over the fence flat-footed.
Wash your feet! Make a weatherproof frame with four three-inch-tall boards. The box shown is 16 inches square. Fill it will several layers of smooth, flat stones - river stones look particularly handsome and are easy on the soles. Sand/dirt rinses away into the stones below, leaving bare feet clean.