Purity: Purification of Hair on Head and Face with Qalīl Water
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 167
If the hair on one’s head and face [become impure and] is washed with qalīl water, in case there is not a lot of hair, it is not necessary to apply pressure to take out the remaining water because a regular amount of water will come out of its own accord.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)