You might reconsider after you read this: Microbiologist Dr. Anthony Hilton of the UK’s Aston University says the average family car is a rolling dining room that’s rarely cleaned. And that leaves the interior covered with illness-causing germs, which can trigger everything from skin infections to vomiting. And the bugs are mostly found on the steering wheel, gearshift, and door handles. If you allow food in your car, Dr. Hilton recommends treating your vehicle as an extension of your home. And make sure you clean and disinfect it at least once a week.