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vendeur d'huile de serpent
Snake oil is a real thing. It's used to lubricate and clean the woven-steel "plumbing snakes", used to clear clogged drain pipes.
https://www.npr.org/sections/codeswitch/2013/08/26/215761377/a-history-of-snake-oil-salesmen
I can't find the snake oil you are trying to sell me anywhere
but I found out a few things.......I didn't know of, the Chinese connection......
On Amazon plumbing, General Wire SOQ Snake Oil is one brand.
There is ramifications though
......it is not in any of the major dictionaries.......
it is a known noun
.......you should let them know