To attain the highest washing efficiency by the best method by fitting a magnet on a pulsator or on the inner wall of a water tub immersively in washing water.

A magnet is fitted on a pulsator or on the inner wall of a water tub immersively in washing water. Lines of magnetic force are vertically radiated from the surface of the magnet, and a washing stream perpendicularly crosses the lines of magnetic force. The water of this stream has large clusters collected with 12 water molecules H2O made of O- (charge part) and H+ (charge part) in average. The O- and H+ constituting the large clusters advance in opposite directions to each other according to the Fleming's left hand rule while they perpendicularly cross the lines of magnetic force. The regularity forming the large clusters is disturbed, and the large clusters are divided into small clusters collected with six water molecules in average. The water of the small clusters has the dissolving power stronger than the water of the large clusters, a detergent is quickly dissolved into fine grains, and stains can be easily dissolved.