| abstract |
PROBLEM TO BE SOLVED: To remove fine particles firmly adhered from a substrate surface by imparting a moderately controlled etching property without impairing the flatness of the surface of a magnetic disk substrate, and further using a surfactant. Stable dispersion of the detached particles in the cleaning agent achieves excellent particle removability, improving the yield rate during manufacturing and enabling highly efficient advanced cleaning that enables cleaning in a short time An object of the present invention is to provide a glass substrate cleaning agent for a magnetic disk. A glass substrate cleaning agent for a magnetic disk comprising a surfactant (A), wherein the pH at 25 ° C. at an active ingredient concentration when used as a cleaning liquid is less than 5, A glass substrate cleaning agent for a magnetic disk, wherein an oxidation-reduction potential (V) at 25 ° C. at the same concentration (unit: mV, vsSHE) satisfies the following formula (1). V ≦ −38.7 × pH + 550 (1) [Selection figure] None |