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Although germs can live on most any surface, they are more likely to collect in certain places than others. In most schools the restrooms are cleaned at least once per day, but there are some areas that are frequently overlooked. It is estimated that 80% of all infections are caused by coming into contact with a contaminated surface.  Toilet seats aren't actually as bad as we think they are, and they are usually cleaned on a regular basis.  Door handles collect a lot of germs. The inside latch of a toilet stall has been touched by many students after using the toilet and wiping themselves. Many students also skip washing their hands, and then transfer their germs to the exit door as they leave. You can use a paper towel to open a door so that your hands don't get dirty. If you are a boy, there is no need to be shy about peeing in a urinal next to other boys.  This is a perfectly normal thing to do, avoids unnecessary contact with germs inside the toilet stalls, and helps to keep the stalls cleaner for everyone else. Cafeteria trays aren't always cleaned between meals. Dishes are always washed after use, but the trays are sometimes overlooked.  If you carry hand sanitizer, use it to wipe your tray before you get in line. Don't allow your tray to come into contact with any shared surfaces after it's been cleaned. The average desk is used by five or six students in a single day. If any of those kids were sick, they probably left some germs behind.  Keyboards and mice are also likely to collect germs. Hand sanitizing wipes are the quickest way to clean shared surfaces. Some students put their mouths directly on the faucet, passing along their colds and flu to the next person in line. Try to avoid contact with the spout, and run the water for a few seconds before drinking.  There may be as many as 2.7 million bacteria per square inch living on a public drinking fountain spigot.  If you want to be even safer, carry your own water bottle instead.  Many schools now have stations where you can refill your water bottle without pressing a button. Art supplies are often shared, and seldom cleaned. Multiple students may be using the same art supplies in different class periods. Apart from rinsing paint out of brushes, cleaning art supplies is not usually a big priority for students or teachers. Although proper etiquette dictates wiping off exercise equipment after using it, not everyone does this. Shared equipment like balls, bats, and helmets can also be a hotbed for germs. Outdoor facilities like park benches and playground equipment are usually not cleaned on a regular basis. Since these items are shared by a great number of students over the course of a day, they tend to collect a lot of germs.  Playground equipment has been shown to harbor trace amounts of fecal matter along with viruses and bacteria.  Run the water for a few seconds before drinking from the water fountain. Even better, carry your own water bottle instead.
Be careful in the bathroom. Sanitize cafeteria trays before using them. Give your desk a quick wipe before sitting down. Use care when using a drinking fountain. Clean more than your brushes. Avoid using shared sports equipment that hasn't been washed. Try not to touch playground equipment or picnic tables with your bare hands.