Sayyiduna Ali (may Allah be pleased with him) said: I used to suffer from excessive discharge of madhiy, so I asked the Prophet (peace and blessings be upon him) about its ruling. He said: "Only wudu is obligatory in the case of madhiy."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 890
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لضعف يزيد بن أبى زياد