Third World HYGIENE.
The Big Bang Theory Season 5, Episode 1
Intelligence,
ruthless attention to HYGIENE...
The Big Bang Theory Season 2, Episode 13
I'm scrupulous about my HYGIENE,
I regularly disinfect my hands...
The Big Bang Theory Season 3, Episode 15
And after that I'll make up my own rules
of oral HYGIENE...
The Big Bang Theory Season 6, Episode 21
I also have an idea for a bulk,
mail-order feminine HYGIENE company.
The Big Bang Theory Season 1, Episode 4