Musannaf Ibn Abi Shayba 1:902

Waki’ narrated to us, from al-Sari, from al-Hasan ibn Yahya, from ‘Abd al-Karim ibn Rashid, from Anas, regarding a man who became in a state of janabah (major ritual impurity) in his garment and did not see its trace: He said, "He washes all of it."