I never think its ok to hit your child in any way shape or form. That is a form of child abuse.
With a child who can’t understand not to go run into the street, you don’t allow them a chance to run in the street. Either they stay in a stroller or get worn in a carrier or wear a harness. Its not a punishment, its an affect. If they can’t listen, they can’t be placed in a situation where you are setting them up to fail.
And soap in the mouth is DANGEROUS. I can’t imagine anyone subjecting thier poor child to soap.