PROBLEM TO BE SOLVED: To provide a method for cleansing medical equipment, excellent in cleansing force.SOLUTION: The method for cleansing medical equipment having protein stains adhered thereto includes cleansing the medical equipment with a treating solution containing (A) 0.004 to 1 mass% of monoethanolamine, (B) 0.005 to 2 mass% of a chelate agent, (C) 0.002 to 1 mass% of a surfactant, (D) an alkali protease, and water, and having a pH of &ge9.