Cleaning the Private Parts
mentioned in the title
In the name of Allah, the Inspirer of truth
Cleaning one’s private parts with water (istinja’) to remove physical impurity after passing urine/stool is an integral part of personal hygiene.
Urine is categorised as a heavy impurity and must be cleaned properly. According to a hadith, negligence regarding leaving the body impure from urine droplets leads to punishment in the grave.
Besides this, a woman should keep herself as clean as possible during the days of menstruation (hayd). Therefore, a menstruating woman should use water to cleanse herself after urination.
And Allah knows best.