"Hey, you didn't wash your hands, you need to go back and put on soap and water. Scrub for at least 20 seconds."
Mary Juan's fish stall is just a few meters from the newly installed handwashing station in the Gudele market in the capital Juba. She is making sure no one can pass without putting soap and water on their hands.
"I've been listening to the hygiene promoters here, people like Rose. I've learned how you should do it," Mary says.