Musannaf Ibn Abi Shayba 1:974

974. Ibn ‘Ulayyah narrated to us, from Khalid, from Abu Qilabah, from his uncle Abu al-Muhallab, who said: There was a person among his family who would perform ghusl (full washing) because of madhy (pre-seminal fluid) that would come out after urination. He said to him: "Wudu (ablution) is sufficient for it."