| abstract |
(57) [Problem] To provide a cleaning agent capable of efficiently removing oils and fats, abrasion powder, and the like attached to the surface of an Al-based metal material to be cleaned without corroding the surface. A cleaning agent for cleaning an Al-based metal material, comprising: (a) an alkali builder, (b) an organic phosphonic acid compound, (c) a surfactant, and (d) a Ca compound and / or B. It is a cleaning agent which is made of an alkaline aqueous solution containing the compound a and exhibits a high cleaning action without corroding the Al-based metal material. |