Sayyiduna Anas (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "When a woman bathes after her menstruation, she should undo her hair and wash it with khitmi (marshmallow) and ushnan (potash); but when she bathes after janabah, she should pour water over her head and wring out her hair."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Salamah bin Subayh al-Yahmadi, and I have not found anyone who mentioned him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1479
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الكبير للطبراني برقم: 755»