Why is Yao Liu clean and hygienic?

Why is Liu Yong clean and hygienic? This is a common mantra in Liu Yong's video, because Liu Yong is a video recording life in India, and most Indian food comes out of the circle with the production process and Ganges water, so Liu Yong will add a clean and hygienic sentence to the video to ridicule, and it will come out of the circle over time.