A method for treating laundry spraying a liquid with dissolved detergent into a drum holding laundry, delaying for a predetermined time period after spraying the liquid to allow the detergent to be absorbed in the laundry, spraying steam into the drum to rinse the laundry, and supplying heated air into the drum to dry the laundry. The detergent including 5 to 10 wt % of polyoxyethylene alkylether, 3 to 10 wt % of sodium ethylhexyl sulfate, and the balance of water.