I was working on an article for the New York Times about how to hand-launder clothes when a friend of mine texted me, “I have a question about hand-washing my gross underwear. How do you get them actually CLEAN? Do you scrub the crotch? Do you use a special detergent for, erm, “protein stains”?
Source: LifeHacker – How to Hand Wash Underwear (And Actually Get Them Clean)