Purity: Purification of the Urinary Outlet with Water
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 62
The urinary outlet does not become pure with anything other than water and washing it once is sufficient, although the recommended precaution is that it should be washed twice, and it is even better to wash it three times.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)