After the lower castes collect as much grain as they can carry away, the benefactors will "purify" the temple by washing it with milk.

CNN: HE GODS WERE DRINKING

His job is to identify the bad spirits that are attaching themselves to the juus (soul) of a person, and by placing himself in a trance he is able to purify the afflicted soul.

BBC: Borneo��s mystical Meratus Mountains