Dirty cloths containing grease and oil stains are cleaned by adding detergents to water Stains are r...........

Explanation:

Adding detergent to water reduces its surface tension. Detergents and soaps have something called surface-active agent, or surfactants for short.Surfactants in detergents play a very important role here. On one end, they attach themselves to the water molecules and on the other end, they attach themselves to the dirt present in unclean clothes. The surfactants help spread water, then they act on the grease by attaching themselves to it, and when this water is disposed of, it carries away all the dirt with it.