No, it is not true that there are frequent travelers who will boil their underwear in hotel kettles. While some people may be tempted to use the kettle for this purpose, it is generally considered unhygienic and a health hazard.
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The kettle is frequently used to cook rice, warm up small towels and clean/wash underwear. A lot of hotels don't expect guests to do this (and aren't aware of this behavior) and don't 'deep' clean the kettles. For your own personal hygiene, avoid using the kettles in hotel rooms.
Glassware, linen and the TV remoteTypically, they don't get cleaned between guests and become a breeding ground for bacteria. Use the pillows from the closet; they're more likely to be freshly washed than the ones on the bed.
What You Cannot Take From a Hotel Room. Guests often take towels, irons, hairdryers, pillows, and blankets, according to the housekeeping department at Hilton Kingston. Cable boxes, clock radios, paintings, ashtrays, light bulbs, TV remote controls—even the Bible—are commonly stolen as well.