They just slosh them around in the dirty ol' rinse water that doesn't get changed all day/evening and and you get all the nasties from the previous imbibers. Bleh.
So not washing in a machine in with soapy water and then drying them at temeperatures to kill off any nasties then likey do at "
Pots of Evil" in Munich.
Likewise at the Wies'n they wash all the Mass in industrial diswashers.