Sunan an-Nasa'i · Hadith 395
It was narrated that 'Adi bin Dinar said:"I heard Umm Qais bint Mihsan say that she asked the Messenger of Allah (ﷺ) about menstrual blood that gets on one's clothes. He said: 'Scratch it with a stick and wash it with water and lotus leaves
Sahih · Abu GhuddahSahih · Al-AlbaniSahih · Zubair Ali Zai