What is the ruling on sewage water spread in the streets, and what are the implications of bodies and clothes coming into contact with it?

Wastewater that has been altered by impurity is considered impure, and anything it touches becomes impure. If wet impurity touches clothes, they must be washed with pure water. However, if impurity touches clothes or a car while it is dry, the dry clothes do not become impure by touching the impure car body or its tires.