It is narrated from Sayyidah Umm Qays bint Mihsan (may Allah be pleased with her) that she asked the Messenger of Allah (peace and blessings be upon him) about menstrual blood that gets on clothing. He (peace and blessings be upon him) said: "Wash it with water and lote-tree (sidr) leaves, and scrape it with a bone."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21909