On a trip to Vietnam, a friend of a friend, kept sending her glass of water back to the kitchen, because she could see a greasy film on the water. No luck. Discovered, while walking to the bathroom, a woman, squatting on the floor, washing dishes with a cold water garden hose, and a basin of water.
I figure it helps build us your immune system.
This obsession with avoiding germs is one of the reasons we have so many new allergies that never existed before. It’s like a muscle, “Use it or lose it.”