Why do I always get a Jim Jones (Kool-Aid) vibe whenever the topic of water cleaning briars comes up?
Years of setting around the Briary having guys tell stories about their pipes, I always heard the ones that had the punchline... and then it fell into the river, or bathtub, or pool. I started asking the guys, "then what?" And, they'd look dumbfounded, "well, it was destroyed."
"How was it destroyed?"
"It got wet."
"What did getting your pipe wet do to it that was terrible?"
Then they'd just look at me with that, 'I-never-thought-the-story-through-to-this-point' look on their faces. But, I was curious, why would that kill a pipe? And, obviously for a very long time guys have thought this... mostly without ever giving it much thought.
It's a weird thing, this idea of water destroying pipes, when clearly it does no such thing. It's like when you tell a five year old that there is no Santa Clause. It is a long held belief that was never questioned at all.
So, yeh, it is a little cultish sounding.