Patent ID: 7930785

Claim:
A method for cleaning a washing tub in a washing machine comprising: a detergent removing step for removing detergent from the washing tub; a washing water supply step for supplying washing water to the washing tub; a laundry amount sensing step for sensing a laundry amount in the washing tub for determining whether to proceed to a next step or not; a soaking step for soaking dirt on a surface of the washing tub after applying the washing water to the dirt by moving the washing tub; and a washing step for washing the washing tub, if it is determined to proceed to the next step in the laundry amount sensing step, wherein the detergent removing step comprises: a washing water supply step for supplying the washing water to the washing tub; a detergent washing step for moving the washing tub to make the washing water in the washing tub to move for washing the detergent from the washing tub; and a draining step for draining the washing water, wherein the draining step in the detergent removing step starts in the middle of the detergent washing step.