Safai Mitra’ playing important role in nation-building: President Murmu

''They protect us from diseases, dirt, and health risks. They are playing a very important role in nation-building. The biggest credit for our achievements in the field of cleanliness at the local, state, and the national level goes to our Safai Mitras,'' she said addressing the ''Safai Mitra Sammelan'' in Ujjain.