Open all 8 gates of Jannah by saying this after Wudhu

Prophet said

Whoever performs wudhu (ablution) and does so well, and then says,

Ashhadu al-la ilaaha illallaah wahdahu la shareeka lahu wa ashhadu anna Muhammadan 'abduhu wa rasuluhu

(I testify that there is no diety worthy of worship except Allah. He is Alone, having no partners. And I bear witness that Muhammad is His slave and messenger)

all eight of the doors of Paradise are opened for them--and they can enter from whichever they wish.

(Sahih Muslim)