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Cleaning personnel in hotels, motels and bed and breakfasts expects to be tipped. You leave a bill (usually 10 - 20 DM, according to the length of your stay) in your room, possibly with a note, e.g. "Fuer das Zimmermaedchen". Tipping in restaurants is also very common. You give your tip directly to the waiter when you pay the bill. Do not leave it on the table, as is customary in the US. If you are displeased with the service, you do not have to leave a tip at all.