What's the noun for ablution? Here's the word you're looking for.
ablution
The act of washing something.
(chemistry) Originally, the purifying of oils and other substances by emulsification with hot water; now more generally, a thorough cleansing of a precipitate or other non-dissolved substance. [First attested from around 1350 to 1470.]
(Western Christianity) The rinsing of the priest's hand and the sacred vessel following the Communion with, depending on rite, water or a mix of it and wine, which may then be drunk by the priest. [from 17th c.]
The liquid used in the cleansing or ablution. [From early 18th century.]
(Eastern Orthodoxy) The ritual consumption by the deacon or priest of leftover sacred wine of host after the Communion.
(plural only, Britain, military) The location or building where the showers and basins are located. [From mid 20th century.]