Before Lebaran, usually people will clean house to parts that can not reach, such as the corner cupboard, window, under mattresses, and so on. In the old days people usually outsmart her using fresh bread to remove dust in hidden places.
Only by forming the bread into small circle, put the bread in places that are hard to reach nesting place his dust. The content of water in the bread is believed to be made of dust-dust sticking to the small bread circle.