Provided is an antibacterial agent which is useful for the removal of pink mold produced in the living environments. The antibacterial agent is obtained by combining a quaternary ammonium salt that is described as the component (A) below and an organic solvent that is described as the component (B) below. (A) One or more quaternary ammonium salts selected from among dialkyl dimethyl ammonium salts and alkyl benzyl dimethyl ammonium salts. (B) One or more organic solvents selected from among aromatic alcohols, aromatic aldehydes and the compounds represented by formulae (1) and (2) (wherein R represents an alkyl group or alkenyl group having 5-10 carbon atoms or a benzyl group A represents an alkylene group having 1-10 carbon atoms and n represents a number of 0-5 and the n-numbered A groups may be the same or different).本發明提供一種對生活環境中所產生之粉紅污垢之去除有用之抗菌劑。本發明之抗菌劑係組合以下成分(A)所示之四級銨鹽及(B)所示之有機溶劑而成者:(A)選自二烷基二甲基銨鹽及烷基苄基二甲基銨鹽之一種以上之四級銨鹽;(B)選自芳香族醇、芳香族醛、下述式(1)及(2)[式中,R表示碳數為5~10之烷基或烯基、或苄基,A表示碳數為1~10之伸烷基,n表示0~5之數,n個A可相同,亦可不同]所示之化合物之1種以上之有機溶劑。[化1]
