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(57) [abstract] (with correction) [Problem] It has high detergency against sulfur-containing plastic lens resin stains with a refractive index of 1.55 or more, suppresses corrosion of molded glass molds, and is safe for the human body during cleaning. To provide a washing method which is excellent in dyeing property and dyeing property. In cleaning a molded glass mold used for manufacturing a sulfur-containing plastic lens having a refractive index of 1.55 or more, (A) General formula (1): (Wherein, R 1 is a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms, n is an integer of 1 to 4, X is a divalent or trivalent group, One (monovalent) bond is bonded to an aromatic ring, the remaining bond is a group bonded to Y, Y is a monovalent group, and m is an integer of 1 to 3. 8) to 75% by weight of an oxygen atom-containing monocyclic aromatic compound represented by the formula (excluding phenol, aromatic carboxylic acid and aromatic carboxylic acid ester), and (b) 0.3 to 20% by weight of an inorganic alkali agent. A washing method comprising the step of washing with a detergent containing (c) 0.005 to 5% by weight of calcium ion-releasing substance (calculated in terms of calcium ions) and (d) 9 to 91% by weight of water. |