Prophet Muhammad -peace be upon him- said: “the key of prayer is being purified”, and This is the correct way to perform ablution:
1-Intention and its place in the heart, not utter it.
2-'Altasmiah': Saying 'In the name of Allah'.
3-Wash hands to wrists three times.
4-Rinsing the mouth three times.
5-Doing Inhalation three times.
6-Washing the face three times, the boundaries of the face from the bottom of the hair to the chin and even the ears.
7-Washing the hands to the elbows three times, and start with the right, then the left.
8-Wiping on the head or some of it at once.
9-Wiping the ears once.
10-Washing the feet up to the heels -the two prominent bones on the sides of the foot-, and beginning by washing the right and then the left.
It is from 'Sunnah' to make water pass through the fingers during ablution.
It is from 'Sunnah' to make water pass through the beard -for men- when washing the face during ablution.
It is from 'Sunnah' to say this supplication after ablution: “I bear witness that none has the right to be worshipped but Allah alone, Who has no partner, and that Muhammad is His slave and His Messenger. O Allah, make me among those who turn to You in repentance
and make me among those who are purified. Glory is to You, O Allah, and praise; I bear witness that there is none worthy of worship but You. I seek Your forgiveness and turn to You inrepentance.”