| abstract |
The present invention provides a cleaning composition for a hard disk substrate and a method for cleaning the hard disk substrate, which can remove fine particle stains derived from an abrasive such as colloidal silica with high cleanliness. In a cleaning composition used for cleaning a hard disk substrate, an alkali metal hydroxide (A), a water-soluble salt containing a transition metal (B), a chelating agent (C), and a peroxide ( D) and the ratio of the chelating agent (C) is 0.5 molar equivalent or more with respect to the water-soluble salt (B) containing the transition metal. . [Selection figure] None |