PROBLEM TO BE SOLVED: To provide a method for cleaning oil adhering to a hard surface, which can efficiently clean oil adhering to a hard surface. A method for cleaning oil adhering to a hard surface, wherein a cleaning agent stock solution containing a total of 80% by mass or more of polyoxyalkylene alkyl ether and fatty acid alkanolamide is prepared, and the cleaning agent stock solution is mass-produced. A step of preparing a cleaning agent by diluting it 5 to 100 times with water according to the standard, a cleaning step of bringing the cleaning agent into contact with a hard surface to clean the adhering oil, and a cleaning step of cleaning the hard surface with water. Immediate steps and methods for cleaning oil adhering to hard surfaces. [Selection diagram] None【課題】硬質表面に付着した油を効率的に洗浄することができる、硬質表面に付着した油の洗浄方法を提供する。【解決手段】硬質表面に付着した油の洗浄方法であって、ポリオキシアルキレンアルキルエーテル及び脂肪酸アルカノールアミドを合計８０質量％以上含む、洗浄剤原液を用意する工程と、前記洗浄剤原液を、質量規準で５倍から１００倍に水で希釈して、洗浄剤を調製する工程と、前記洗浄剤を、硬質表面に接触させて、付着した油を洗浄する洗浄工程と、前記硬質表面を水ですすぐ工程と、を備える、硬質表面に付着した油の洗浄方法。【選択図】なし
