I have never heard of anyone putting Saran Wrap over the toilet bowls when the house is unoccupied for a long period of time but I can see where the evaporation of toilet bowl water might allow for sewer gas to leak into the house. Not a bad idea for that.
However, for the purpose of keeping out snakes or rats - RIDICULOUS.
The snakes or rats would have the same probability of getting into the house through the toilet if the house was occupied or not. Would you put Saran Wrap on your toilets when you are home everyday? Of course not.
I have never heard of anyone actually having a snake or rat come up through the toilet. I have heard of people saying they know of someone but it has always been second or third hand accounts.
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