When I was working at a data entry firm, we had one dude who refused to take showers.
We took turns spraying his seat with Lysol whenever he left the room.
That didn't work, so we put a pot of potpouri next to his keyboard.
That had no effect either, so we had a group intervention:
"Dude, go home, take a bath, and don't come back until you no longer stink."
The man quit and never came back. *shrugs*