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Detergents are better cleaning agents:
Detergents have two different ends-one water liking(hydrophobic) and the other oil liking(hydrophobic).when a dirty greasy object is placed in water containing detergent,the oil liking ends join up with the grease.the grease is then effectively coated with the water-liking endsa and therefore dissolves in the water.some dirt is muddy,in this case the detergent makes the water to wet the fabric better thereby tending to push the dirt off.Agitation helps this operation n it is provided by the washing machine.