David Macaulay's "Motel of the Mysteries" (https://www.goodreads.com/book/show/108831.Motel_of_the_Myst...) satirizes this bias, with archeologists from 4022 inspecting a modern day motel room and uncovering the "holy" toilet. It's a gem.
one of my favorite books of all time.
I actively look for these books I remember little snatches of... I thought this one was a Stanislaw Lem book, and though I really, really enjoyed "Memoirs found in a bathtub" - but that wasn't this. The chant of "sanitized for your protection" during the ritual use of the toilet really sticks out in my childhood memory. I wonder if it will be as great, reading it as an adult?