Detergent composition for metal product and method for cleaning metal product using said detergent composition

A detergent composition for metal product, prepared by blending at least an amine, a carboxylic acid, a nonionic surfactant (component D), and water (component E),

• the amine comprises an amine (component A) represented by general formula (I):
• in the general formula (I), R1 and R2 are each independently a hydrogen atom, an alkyl group having 1 or more and 6 or less carbon atoms, a phenyl group, a benzyl group, an aminoethyl group, a hydroxyethyl group, or a hydroxypropyl group and R3 is a hydroxyethyl group or a hydroxypropyl group;
• the carboxylic acid consists of a dicarboxylic acid (component B) represented by general formula (II):
• HOOC—R4—COOH (II)
• in the general formula (II), R4 is an alkylene group having 10 or more and 12 or less carbon atoms, and
• a monocarboxylic acid (component C) represented by the general formula (III):
• R5—COOH (III)
• in the general formula (III), R5 is a linear or branched alkyl group or alkenyl group having 13 or more and 21 or less carbon atoms;
• the nonionic surfactant (component D) is a nonionic surfactant represented by general formula (IV):
• R6—O-{(EO)n/(PO)m}-H (IV)
• in the general formula (IV), R6 is a secondary alkyl group having 12 or more and 18 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is an average number of moles of EO added, m is an average number of moles of PO added, n is a number 2 or more and 20 or less, m is a number 0 or more and 20 or less, and forms of PO and EO added in curly brackets may be either random arrangement or block arrangement;
• wherein
• a pH of the detergent composition for metal product is more than 7 and 10 or less.