Patent ID: 7368064

Claim:
An aqueous cleaning solution consisting of: 1.0 to 5.0 mass % of a fluorine-containing compound; 0.2 to 5.0 mass % of a chelating agent; 0.1 to 3.0 mass % of an organic acid salt; and water, and wherein said cleaning solution is capable of cleaning a substrate on which a nickel silicide layer is formed, wherein said fluorine-containing compound is at least one compound selected from the group consisting of hydrofluoric acid, ammonium fluoride, and amine fluoride, wherein said chelating agent is selected from a group consisting of chelating agents having an acid dissociation constant pKa n of 8.0 or greater at 25° C. when a dissociation stage for a basic acid having a valence of n, wherein n being an integer of 1 or greater, is n-th stage, and wherein said organic acid salt is selected from carboxylic ammonium salt having an acid dissociation constant pKa n of 2.5 or greater at 25° C. when a dissociation stage for a basic acid having a valence of n, wherein n being an integer of 1 or greater, is n-th stage.