The tip doesn’t have to be big — $1 to $5, says the American Hotel and Lodging Association. But fewer than a third of hotel guests leave any money for the housekeepers.

The hotel association publishes a gratuity guide on its website that offers suggestions for tipping everyone from valet attendants to bellhops.

But why are housekeepers often forgotten? A common explanation is that they are out of sight and, therefore, out of mind — that travelers are likely to tip only employees they directly interact with. But another cause may be a simple lack of awareness.

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