It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to bathe with the water left over by Sayyidah Maymunah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 900