PURPOSE: To wash fabrics such as bed sheet in a machine efficiently under an optimum condition by combining separate constituents of a detergent with the other constituents in a detergent container in a washing bath.

CONSTITUTION: A constituent with specific modes acting on dirt in a detergent (e.g. bleach, bleach activating agent, sterilizing agent, foam regulating agent, decoloring agent, redeposition preventing agent, enzyme, and softening agent etc.), is contained in a form such as capsule, tablet or pellet in a container and introduced in a wash bath with the detergent mixture containing the other constituents in the detergent container so as to be diffused to wash a bed sheet or the like.