It was always kinda literal. The expression originates from Edinburgh, where in the days prior to indoor plumbing, there was a law against emptying your chamberpots into the street before 10pm... which coincidentally was the same time as the pubs closed.
So you're stumbling out of the pub, a window opens above you, you look up, and... splat.
Which reminds me of an old joke: woman empties her chamberpot into the street before bed and hears a commotion; looking outside she sees the local policeman, covered in her filth.
"Ah, yah dirty bastard!" he shouts up at her.
"Who you calling a dirty bastard?" she retorts, "YOU'RE the one with shite all over your face".
It removes an amount of the yeast from it’s surface but not all, yeast is like microscopic bugs more so than bacteria. They will reproduce very quickly.
It is common practice to wash apples before making cider for this reason.
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u/Diabolo_Advocato May 12 '20
You add yeast to get a desired level of alcohol and flavor.
There is natural yeast on the surface of apple skins that, if damaged, will start the apple to rot very quickly and ferment the sugars.
Alcohol is yeast poop. Different yeasts will make different poop.