Oil fumes are often described as smelling like “dirty socks,” or as being musty, moldy, or foul. Hydraulic fluid fumes often have a distinctive acrid odor.
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There is a valve on the storage tank that opens when a toilet is flushed and closes when the toilet is not in use – to prevent odours from leaving the tank. This helps to keep the smell down from so many people using the toilet during a flight. The blue chemical helps to keep the smell down as well.