Abu Hurairah reported that the Messenger of Allah, upon whom be peace, said to Bilal, “O Bilal, tell me what good deed you have done in Islam that I hear the sound of your footsteps in Paradise?” Bilal said, “That after I purify myself during the day or night, I pray with that purification as much as Allah has destined for me.” (Related by al-Bukhari and Muslim.) ‘Uqbah ibn ‘Aamr related that the Messenger of Allah, upon whom be peace, said, “If one performs and perfects his ablution and prays two rak’ah with his heart and face (completely on his prayer), Paradise becomes his.” (Related by Muslim, Abu Dawud, Ibn Majah and Ibn Khuzaimah in his Sahih.) Khumran, the client of ‘Uthman, added, “I saw ‘Uthman call for water for ablution, pour it from the pot onto his right hand and wash it three times. He then put his right hand into the container, rinsed his mouth and nose and blew the water out. Then he washed his face three times, followed by his arms up to the elbows. Then he washed his feet three times and said ‘I saw the Messenger of Allah, upon whom be peace, make ablution like this.’ And then he would say, ‘Whoever makes ablution like this and then prays two rak’ah without having any other concern on his mind, all his past sins will be forgiven.” (Related by al-Bukhari, Muslim and others.)
Other practices (protecting the eyes and wrinkles, removing any rings, wiping the neck, and so on) have not been mentioned here as their narrations are still questionable. But, one may follow them as part of general cleanliness.