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I personally not aware of this level of hygiene in any culture or religion
Nevertheless, the practicing of this hygiene is part of religion practicing.
5 times Waduu (wash of hands, face, arms, head and ears, and legs) is a must for prayer. Not doing Waduu means prayers are not done.
Again, in any race someone is always winning. So someone, somewhere in the world, will always be most hygienic. But that doesn't demonstrate that their advice came from a supernatural being. So how did you conclude that?