濯污扬清
    Pinyin: zhuó wū yáng qīng

    Explanation: 濯洗。洗去污垢，激扬清澈。比喻扬善除恶。

    Source: 《南史·范泰传》臣昔谬得待罪选曹，诚无以濯污扬清。然君子之有智能，犹鵷凤之有文采，俟时而振羽翼∥患不出云霞之上？”