What are the intentions and supplications related to all types of ritual purity (such as major ritual impurity)?

No specific mention or supplication has been reported as recommended during ablution (Wudu') or ritual bath (Ghusl (definition)) other than saying "Bismillah" (In the name of Allah). As for the intention (Niyyah (definition)), its manner is to be in the heart when performing Ghusl to remove major ritual impurity or to purify oneself for prayer, and when performing Wudu' to remove minor ritual impurity or to perform something that is not permissible without Wudu'. It should not be uttered verbally. The proof for the obligation of intention is the Prophet's (peace be upon him) saying: "Indeed, actions are by intentions."