Hammam said that a guest came to Aishah (may Allah be pleased with her), and she (may Allah be pleased with her) sent a message to him inviting him. It was said: He has become junub (in a state of major impurity) and is washing his clothes. Aishah (may Allah be pleased with her) said: Why is he washing them! I used to simply scrape semen off the clothes of the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4168