In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- Prophet Muhammad (peace be upon him) said, “Whoever of you performs wudu carefully and then affirms: ‘Ash-hadu an la ilaha illallahu Wahdahu la sharika Lahu, wa ash-hadu anna Muhammadan ‘abduhu wa Rasuluhu [I testify that there so no true god except Allah Alone, Who has no partners and that Muhammad is His slave and Messenger],’ the eight gates of Jannah are opened for him. He may enter through whichever of these gates he desires (to enter).” (Muslim)
2- Imam At-Tirmidhi added another duaa: (Allahumma ij`alni minat-tawwabina waj`alni minal-mutatahhirin. O Allah, make me among those who turn to You in repentance, and make me among those who are purified.)
Sheikh Suleiman Hani answers your question in the following video:
Almighty Allah knows best.