I have to agree, hair hygene is pretty low on my list. Though if one has lice, maybe it would be more important. Then I'd personally just shave, but I hear gasoline kills lice too. Not that I really endorse that idea (Michael Jackson rerun, anyone?)

Where I live right now, I'd just dunk my head in a bay somewhere. which probably would leave me with enough oily residue to bring up the topic in the above paragraph.