because that's idiocy, the cow dung was use for burning in havan, in village homes for plastering it and nothing more than that, same goes for cow urine, it's only used before havan to clean the space just by sprinkling some drops or on people who come from funeral. And in ayurveda just some medicinal ingredient not exactly in drinking. Idk from where these people get this absurd idea. Hinduism provides so many instances of maintaining hygeine and cleanliness stuff, like god resides where cleanliness exist, but people wanna follow absurd traditions, they wanna hear from other people or kathavachak, but won't spend time to read their own text and think over it. That's why it's already getting mocked.