Sunan Ibn Majah Book 1, Hadith 202
The Messenger of Allah performed ablution, then he turned inside out the woolen garment that he was wearing and wiped his face with it.
"I brought a piece of cloth (for drying) to the Messenger of Allahwhen he performed a bath to cleanse himself from sexual impurity. He refused it and began to shake off water."
The Prophet said: "Whoever performs ablution and does it well, then says three times: 'Ashhadu an la ilaha illallah wahdahu la sharika lahu, wa ashhadu anna Muhammadan `abduhu wa rasuluhu (I bear witness that none has the right to be worshipped but Allah alone, with no partner, and I bear witness that Muhammad is His slave and His Messenger),' eight gates of Paradise will be opened for him; whichever one he wants he may enter." (Da'if)
Another chain with similar wording.