What should a person do if they experience obsessive doubts (waswasa) during ghusl or wudu?

Waswasa is a state of indecision, doubt, and baseless suspicion that a person may experience for various reasons. This often manifests as uncertainty about whether wudu or ghusl has been performed, whether it was done properly, or whether it has been invalidated. A person performing ghusl or wudu does not need to repeat their ritual purification due to such obsessive doubts. In fact, one should not pay attention to these kinds of doubts (Ibn Majah, Taharah, 48 [421]), should convince themselves that these suspicions and hesitations are unfounded, and, if necessary, seek psychological treatment. Additionally, as spiritual support, one may recite Surah al-Falaq and Surah an-Nas, reflecting on their meanings, and pray to Allah to be freed from this state.

Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu