The orphanage, named Wat Opot because of the land given to them by the local wat (a Buddhist temple) shows their respect and appreciation by helping to clean the grounds of the wat each Saturday afternoon.
This is the wat, which is literally right next to the orphanage.
You will see these little miniature buildings, called stupas, at any wat in Cambodia. Families pay for them to be built by the monks at the wat, as a way to remember loved ones and family members after they pass away.
The kids clean up leaves and trash around the wat to help keep the grounds looking nice.
Of course some goofing around goes on along with the cleaning.
After cleaning, everyone attends a short service inside, led by one of the monks.