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- Four flight attendants told Insider they recommend passengers keep their shoes on while flying.
- That mysterious liquid covering the bathroom floor? Odds are it's not just water, they said.
- "It's probably bodily fluids that you're walking in," one flight attendant warns.
Keeping your shoes on while flying isn't just the courteous thing to do — according to flight attendants, there's a hygienic reason to avoid walking around barefoot on an airplane. Warning: it's pretty gross.