(N/A) Cleansing action of soaps:
$1$. Soap molecules consist of two parts: a long hydrocarbon chain which is hydrophobic (water-repelling) and an ionic head which is hydrophilic (water-attracting).
$2$. When soap is dissolved in water,the hydrophobic ends attach themselves to the dirt particles,which are typically oily or greasy in nature.
$3$. The hydrophilic ends remain pointed outwards towards the water.
$4$. These molecules arrange themselves in a spherical structure called a 'micelle',with the dirt trapped at the center.
$5$. The negatively charged ionic heads create a repulsive force between micelles,preventing them from re-attaching to the cloth.
$6$. Finally,the dirt is rinsed away along with the water,leaving the cloth clean.