People are confusing "sterile" with "antiseptic." They don't mean the same
thing.
Spit isn't sterile, but it is mildly antiseptic -- which is why animals lick
their wounds. Some people's saliva is so antiseptic that they never develop
cavities.
Urine is not antiseptic. But right out of the body, it is almost bacteria-free.
The Inuit use urine to clean their eating utensils -- the ammonia in it cuts
the seal grease. It's unlikely urine would make a good stop bath, because it's
alkaline rather than acidic.
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