well, after cleaning during Sithi Nakha festival

Sithi Nakha festival, Madhyapur Thimi 2020
The Newar community of Nepal celebrates Sithi Nakha Festival every year on the 6th Bright Fortnight of Jestha in the Nepali Calendar. This festival marks the beginning of the rainy season, so the Newar community celebrates it by cleaning water sources such as ponds, wells, and stone spouts in their areas.