A woman asked Messenger of Allah ﷺ, "O Messenger of Allah ﷺ! What should we do, if the blood of menses falls on our clothes?" Messenger of Allah 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).  

أَنَّهَا قَالَتْ سَأَلَتِ امْرَأَةٌ رَسُولَ اللَّهِ ﷺ فَقَالَتْ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِحْدَانَا إِذَا أَصَابَ ثَوْبَهَا الدَّمُ مِنَ الْحَيْضَةِ كَيْفَ تَصْنَعُ فَقَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَصَابَ ثَوْبَ إِحْدَاكُنَّ الدَّمُ مِنَ الْحَيْضَةِ فَلْتَقْرُصْهُ ثُمَّ لِتَنْضَحْهُ بِمَاءٍ ثُمَّ لِتُصَلِّي فِيهِ  

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.  

كَانَتْ إِحْدَانَا تَحِيضُ ثُمَّ تَقْتَرِصُ الدَّمَ مِنْ ثَوْبِهَا عِنْدَ طُهْرِهَا فَتَغْسِلُهُ وَتَنْضَحُ عَلَى سَائِرِهِ ثُمَّ تُصَلِّي فِيهِ