I say, and with God's success: Among the etiquettes of ablution is to send blessings upon the Prophet  after washing each limb; for Sahl ibn Sa'd رضي الله عنه said : "There is no ablution for one who does not send blessings upon the Prophet ," in Al-Mu'jam Al-Kabir 6: 121, and Al-Suyuti indicated its weakness. See: I'laa Al-Sunan 1: 111. See: Tabyin Al-Haqaiq 1: 6-7, and Majma' Al-Anhar 1: 16, and Bada'i' Al-Sanai' 1: 23-24, and Al-Taa'liqat Al-Mardiya on Al-Hadiyya Al-Ala'iya p. 25, and Allah knows best.