People use a variety of methods to wash clothes. Usually after adding the soap,they 'beat' the clothes on a stone,or beat it with a paddle,scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?

(N/A) soap molecule has two parts,namely hydrophobic and hydrophilic. With the help of these,it attaches to the grease or dirt particle and forms a cluster called a micelle. These micelles remain suspended as a colloid. To remove these micelles (which entrap the dirt),it is necessary to agitate the clothes to dislodge them from the fabric surface.