Interesting. I never even considered this. I'll be washing my hands even more frequently now.
8 Surprising Psychological Benefits of Hand Washing
I wash my hands frequently, but especially in between tasks and when returning home from an outing, even if it's just a walk in the neighborhood and I haven't touched anything. It's a ritual I enjoy, kind of washing away the last task and preparing for the next task. I totally agree with the psychological benefits but for me washing my face or a whole body shower works better at emotionally cleansing my thoughts after making a faux pas. (Oh, I wish I would have said/done that instead, kind of thing.)