Reported by `Uthman bin `Affan (RA): I saw the Messenger of Allah (peace be upon him) performing Wudu' the way I have just done it and said, "He who performs Wudu' like this, his previous sins will be forgiven and his Salat and walking to the mosque will be considered as supererogatory act of worship.'' [Muslim]. Commentary: Wudu is a means of remission of minor sins, provided that the sins are not related to the rights of the people. To perform wudu at home before going to the masjid is highly meritorious.
Riyad us Saliheen, Chapter 185, 1027