The coffee maker’s less welcome second use
The gross explanation is that some travelers have used hotel coffee makers to rinse or boil underwear. The appliance can heat water, and its carafe offers a convenient place to soak a small garment—though that does not make it a proper washing machine. A guest who does this may leave no obvious sign for the next person.
That possibility is what makes an in-room coffee maker different from a sealed, freshly washed cup: the machine’s water reservoir and internal tubing are difficult for a guest to inspect, and the carafe may not get the same attention as dishes in a kitchen. If a machine has been misused, running a brew cycle may not clean every surface that water touches.
Why workers may skip the cup
Flight attendants and hotel employees spend a lot of time in guest rooms and encounter the limits of room cleaning firsthand. Avoiding the machine is a simple way to avoid uncertainty; they can use sealed bottled water or get coffee elsewhere instead. It is a precaution, not proof that every hotel coffee maker has been used this way.
The memorable part is the mismatch between appearance and access: a clean-looking coffee pot can conceal what happened inside its water path—or what someone used the carafe for before checkout.
