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She’s raising the bar on hand washing in schools.

A third-grade teacher in Missouri has a clever hack to inspire kids to vigorously scrub away germs amid the coronavirus outbreak — using a simple stamp and a prize, she said.

Each morning, Shauna Woods marks the hands of students in her class at Hallsville Schools with a black stamp that reads “Mrs. Woods,” she told Good Morning America. At the end of the day, she checks the kids’ mitts and gives them a reward if the marking is gone, she said.

Woods called the game a “great motivator” to get students to wash their hands thoroughly and often.

“Providing a visual reminder and incentive has boosted their hygiene regiment,” Woods told the outlet. “I even joined in on the fun and put a stamp on my hand to be their positive role model.”

She added, “It’s a fact of life that many kids are in close corners, interacting with one another all day. They share many things, including germs.”

Woods posted an image of a student’s stamped hand on Facebook last week, writing “we are doing our best in room 550 to keep the germs away” next to a smiley face emoji. She didn’t say what prizes she had been giving the third graders.

More than 1,200 coronavirus cases and 38 deaths had been reported in the US. Thursday. Kids are more likely to carry the potentially deadly virus without showing symptoms, experts say.