ENOfficial
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.'"
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ سُفْيَانَ، قَالَ حَدَّثَنِي أَبُو الْمِقْدَامِ، ثَابِتٌ الْحَدَّادُ عَنْ عَدِيِّ بْنِ دِينَارٍ، قَالَ سَمِعْتُ أُمَّ قَيْسٍ بِنْتَ مِحْصَنٍ، أَنَّهَا سَأَلَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ دَمِ الْحِيضَةِ يُصِيبُ الثَّوْبَ قَالَ " حُكِّيهِ بِضِلَعٍ وَاغْسِلِيهِ بِمَاءٍ وَسِدْرٍ " .
sunnah.com