A washing machine has a number of functional plates detachably plugged to an inner wall surrounding a washing space of a basket of the washing machine. The inner wall also has a number of spiral drainage ducts connected to an annular recess adjacent to a top opening of the basket. A number of through openings are configured in the annular recess. A rotatable agitation disc is detachably mounted on a bottom side of the basket. The washing machine has no dirt accumulation problem between inner and outer baskets. Its various components are easily detachable and the washing machine therefore is constantly maintained in a clean and sanitary state.
