On the eve of Songkran Day, i.e. on the 12th April, the people clean their house and burn all the refuse. This is a Spring Cleaning Day done as a duty in the belief that anything bad belonging to the old year will be unlucky to the owner if left and carried on to the coming New Year. It is something like a Public Health Cleaning Day but backed by traditional belief has proved more effective to emotional people than prosaic reason.