Patent ID: 7541322

Claim:
A cleaning solution for a substrate for a semiconductor device, which comprises the following components (a), (b), (c) and (d), wherein the weight ratio of the component (a) to the component (b) (component (a)/component (b)) is at least 0.8 and at most 5, and said solution has a pH of at least 1.5 and less than 6.5: component (a): an organic acid; component (b): an organic alkaline component represented by the following formula (I), (R 1 ) 4 N + OH − (I), wherein R 1 is a hydrogen atom or an alkyl group which may be substituted by a hydroxyl group, an alkoxy group or halogen, and four R 1 may all be the same or different from one another, provided that a case where all are simultaneously hydrogen atoms, is excluded; component (c): at least one anionic surfactant selected from the group consisting of an alkylsulfonic acid or a salt thereof, an alkylbenzenesulfonic acid or a salt thereof, an alkyldiphenyl ether disulfonic acid or a salt thereof, an alkylmethyltaurate or a salt thereof, an alkyl sulfate or a salt thereof, an alkyl ether sulfate or a salt thereof, and a sulfosuccinic acid diester or a salt thereof; and component (d): water.