Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) said: A woman came to the Prophet (peace and blessings be upon him) and asked him what one of us should do if menstrual blood gets on her garment. He (peace and blessings be upon him) said: "Take hold of it and scrape it off, then rub it, and sprinkle the rest of your garment."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20664