13 - Light Switch - These can have up to 217 bacteria per square inch.

14 - Door Knobs - Hands are one of the dirtiest parts of the body, and most people use them to open their doors.

15 - Kitchen Sink - Forget the toilet, TODAY reported not long ago how your sink could easily be dirtier than your entire bathroom.

16 - Bathtub - The place you go to get clean may not be the first place you think of when you consider bacteria but the area around the drain can have up to 19,468 bacteria per square inch.

17 - Pillow - Dead skins cells, dust mites, fungal spores, pollens, and other body secretions are all floating around in the place you stick your head at night.

18 - Mattress - Did you know that after 10 years your mattress will nearly double in weight thanks to the number of dust mites and dust mite poop that it has collected?

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