Whenever anyone of us got her menses, she, on becoming clean, used to take hold of the blood spot and rub the blood off her garment, and pour water over it and wash that portion thoroughly and sprinkle water over the rest of the garment. After that she would pray in (with) it.
Sahih al-Bukhari Book 6, Hadith 13
← Previous Hadith A woman asked Allah's Messenger (ﷺ), "O Allah's Messenger (ﷺ)! What should we do, if the blood of menses falls on our clothes?" Allah's Messenger (ﷺ) replied, "If the blood of menses falls on the garment of anyone of you, she must take hold of the blood spot, rub it, and wash it with water and then pray in (with it).

Sahih al-Bukhari Book 6, Hadith 12 Next Hadith → Once one of the wives of the Prophet (ﷺ) did I`tikaf along with him and she was getting bleeding in between her periods. She used to see the blood (from her private parts) and she would perhaps put a dish under her for the blood. (The sub-narrator `Ikrima added, `Aisha once saw the liquid of safflower and said, "It looks like what so and so used to have.")

Sahih al-Bukhari Book 6, Hadith 14