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@Sterile_Technique
Not catholic, so I don’t know their official position, but as I understand, in extreme circumstances any liquid will do.
Part of it involves the idea of “washing”, or “being washed”, so solid water or water in solids would not count. And also the idea of purification, but many use dirty river water.
You could make a solid (HA!) argument for exfoliative or percussive removal of debris from the kid’s head via scraping or knocking the nasty-bits free via the holy projectiles.