| abstract |
Disclosed is a metal cleaner comprising a specific nonionic surfactant, a specific nitrogenated organic compound, a specific carboxylic acid or a salt thereof, and a specific alkanolamine compound and having a pH value of 9 or more as measured at 25 DEG C when the measurement is carried out on a 1-mass% aqueous solution prepared by dilution of the metal cleaner containing water. The metal cleaner has high metal cleaning properties, and also has excellent corrosion resistance, waste water treatment properties, anti-foaming properties and liquid stability. |