The woman who has a prolonged flow of blood should wash herself every day when her menstrual period is over and take a woollen cloth greased with fat or oil (to tie over the private parts).  

الْمُسْتَحَاضَةُ إِذَا انْقَضَى حَيْضُهَا اغْتَسَلَتْ كُلَّ يَوْمٍ وَاتَّخَذَتْ صُوفَةً فِيهَا سَمْنٌ أَوْ زَيْتٌ