Sayyiduna Ali (may Allah be pleased with him) says: I sent Miqdad (may Allah be pleased with him) to the Messenger of Allah (peace and blessings be upon him), and he asked him about the pre-seminal fluid that comes out of a person: what is the ruling on it? He (peace and blessings be upon him) said: "Perform ablution and sprinkle water on your private part."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 563