One study showed that the television remotes and bedside lamp switches are the least cleaned -- but they're also the most touched places in the room. In other words, it might be a good idea to bring some hand sanitizer if you plan to watch TV.

Fox News reveals that many hotel maids do not wash the bathroom glasses out with soap before the next guests arrives. Try to use bottled water, or ask the hotel clerk for plastic cups to be safe.

White duvet covers at hotels are only washed when there are obvious stains. In other words, there are a lot of hidden stains that go unchecked. Yikes.

Just because a hotel lists something as "free" doesn't mean you can take it with you. Before heading out with that pair of fuzzy slippers, make sure the hotel really is providing the complimentary service.

A study done at New York University's hospitality school found that "restocking fees" from the minibar costs an "extra two per cent in revenue and most of that money is pure profit for the hotel." In other words, it might be a good idea to stay away from the hotel fridge completely.

If you do decide to have a drink from the minibar, check your bottles first: One hotel worker discovered that a guest had tried to avoid the minibar bill by refilling the little bottles with urine.

One investigation revealed that cleaners won't always wash the coffee pot, In fact, in a hotel in Cincinnati, Ohio, the pot was found to be cleaned with with a bottle of Lysol mildew remover, and a made was captured on video using the same cloth to clean the coffee maker as she had used to clean the bathroom floor.

There are high rates of suicide in hotel rooms. Even stranger, people who commit suicide in a hotel room often live nearby.

Hotels take fastidious inventories of their towels and robes, so don't try to steal them. In fact, one Miami company has been sewing tags into clothes and towels, that alert the hotel when they go missing.

Bed bugs run rampant in hotels, and you often can't tell you've gotten them until you've checked out. Always be sure to check your hotel mattress for signs of these critters before staying the night.

In July 2003, a man checked into the Capri Motel in Kansas City and slept on the bed for three nights before checking out because of the stink. When cleaners went into the room, they lifted the mattress and found a male corpse (inexplicably wearing a nun's outfit). In other words, that urban legend you heard once is actually true.

Bathroom surfaces are full of germs, a result of bacteria like E.coli being able to survive in spite of routine cleanings.

Hotel carpets are full of allergens, and unfortunately a daily vacuuming isn't enough to clean them up. Bodily fluids, mold, food, and allergens can all hide out in the fibers of the floor.

Don't drink water from a hotel sink. Recently, CBS News reported that “three guests of the EPIC hotel in Miami had come down with Legionnaire’s disease (one later died from the infection). It turns out the hotel’s high powered water purification system was filtering out chlorine from the city water supply, which allowed bacteria to grow." In other words, sometimes hotel water can be TOO purified -- so drink bottled water instead.