<A storeroom for the ancestral inheritance>           Imagine that the house you are living in is an inherited old house that has been in your family for generations, and you intend to make it a more comfortable place to live. The house has a basement. It's a dusky storage place with a musky smell that fills the entire house, and it contains old trunks and tattered boxes holding all kinds of things collected and left behind by your ancestors over the years. It may contain valuable antiques or treasured heirlooms, as well as old accumulated dust, junk, and decaying things that invite the presence of annoying and unwelcome disturbances like rats and cockroaches. Before your home-improvement efforts can be called complete, one of your most important tasks will be the thorough cleaning of the basement storeroom.