Musannaf Ibn Abi Shayba 3:5635

Abu Bakr al-Hanafi narrated to us, from al-Dahhak ibn Uthman, from Muhammad ibn Abd al-Rahman, who said: I asked Sa’id ibn al-Musayyib, Urwah ibn al-Zubayr, Sulayman ibn Yasar, and Abu Salamah ibn Abd al-Rahman about a man from whom *madhy* (pre-seminal fluid) exits. They all said: "Place it in the position of a sore (ulcer); whatever of it you know, wash it, and whatever of it overcomes you, leave it."