Nowhere in OPs comment did he state, or even imply, that he got urine on his hands... The point he was making, which you seem to have missed entirely, is that he ISN'T in fact trying to wash away urine but rather any other nastiness he may have touched throughout the day.
Yes, I was mostly replying to the parent comment. And in general seemed liked everyone in this thread was getting urine on their hands.
I see Mr. Feyman has been woke from the dead, and still feels the need to demand an explanation. People piss on their hands sometimes, own up to that. Let he who has never had a stray pubic hair turn the urine stream into a spring rain shower cast the first stone.