CLEANING AGENT FOR STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide an alkali cleaning agent which has satisfactory iron powder removability in addition to cleanability for oil.SOLUTION: A cleaning agent for a steel sheet includes: (A) an alkali agent; (B) maleic acid and/or oxalic acid; (C) a nonionic surfactant with a specified structure; (D) a chelate agent; and water.