Wudu',Ablutions. The act of running water over your face, forearms, forehead and feet in the correct order and number of times. A symbolic act of purifying the self before one turns one's face towards His Mercy.
And then prayer itself. Likened in the Qur'an to the act of crossing a river. Having crossed a river 5 times in a day, will your clothes not be clean? Similarly, the heart, the Soul.