In 2020, a new coronary pneumonia epidemic suddenly, the epidemic at the moment, hand washing is considered to be one of the most effective preventive measures, and children's resistance is low, when going out hand hygiene is more likely to be ignored, so decided to target children's hand washing effect is not good, hand washing knowledge is difficult to remember, public places timely hand washing difficulties and other issues for this design.
This design is mainly through the way of waterless hand washing, get rid of the restriction on the number of traditional toilets, supplemented by AR hand washing games and breathing lights to eliminate bacteria, enrich the interest of the process, guide children to learn the seven-step hand washing method at the same time, and can intuitively see the "dirty" of hands being eliminated, thus improving the effectiveness of hand washing and children's interest.