Propylene glycol (PG) is generally recognized as safe, GRAS. It shows up in food, cosmetics and pharmaceuticals. You wouldn't want to eat a lot of it, but small amounts are harmless to humans and other animals.
ETHYLENE glycol, on the other hand, is a deadly poison. It is one of the few poisons with a sweet taste.
Didn't intend to hijack; I just had to stick my chemist $0.02 in.
The Swiffer thing smelled like a hoax even before I got to the post that revealed it as such. There are rules about products like that, after all.
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