As the previous poster said, as long as it’s flushed with water it shouldn’t be a problem. You can wipe it down with a damp cloth, if you want to.
If there’s an issue with the piping, I imagine that the pipes should be thoroughly flushed with water before they’re worked on. If they need to be replaced, I would encourage that the old pipes should be buried in a respectable place, since they have had frequent contact with the Blessed Sacrament.