PROBLEM TO BE SOLVED: To provide a method for efficiently washing and disinfecting microorganisms on a hard surface to reduce a hazard caused by the microorganisms.SOLUTION: The method for washing and disinfecting the hard surface includes a step 1 to contact the microorganisms on the hard surface with a component (A) composed of a compound expressed by general formula (1) RO-(EO)n-H (1) (in the formula, R is 8-14C straight or branched chain alkyl or alkenyl EO is ethyleneoxy and n is an integer of 0-5) and a step 2 to contact the microorganisms with a component (B) composed of at least one kind of compound selected from chlorine-based oxidizing agents and cationic disinfectants.COPYRIGHT: (C)2010,JPO&INPIT【課題】硬質表面の微生物を効率よく洗浄殺菌し、微生物に起因する危害を低減する方法を提供する。【解決手段】成分(A)(A)一般式(1)RO-(EO)n-H (1)(式中、Rは炭素数8~14の直鎖又は分岐鎖のアルキル基又はアルケニル基を示し、EOはエチレンオキシ基を示し、nは0~5の整数を示す。)で表される化合物を硬質表面上の微生物に接触させ(工程1)、次いで、成分(B)塩素系酸化剤及びカチオン系殺菌剤からなる群から選ばれる少なくとも1種を該微生物に接触させる(工程2)、硬質表面の洗浄殺菌方法。【選択図】なし