When you share a forklift truck with someone who handles caustics, a man learns to wash his hands BEFORE he pees.

Not just after.

I always wash my hands before. I don't want to get my pride & joy dirty!

As to washing then after there's the apocryphal toilet (washroom) conversation.
1st man (on seeing another zip up his fly & head for the door): "My mother taught me to wash my hands after using the toilet.
2nd man: "My father taught me not to pee on my fingers!"


Cheers
Nigel