I bought this can the other day, to clean the drainage pipes in our bathroom. Nothing peculiar about that, except the warning label on the back informing me that old and rusty pipes could be damaged by this product. Well, how on earth am I supposed to know if my pipes are rusty? Perform a colonoscopy on them? Heck, I don't even know if they're made of plastic or metal, that's how skilled a plumber I am.
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