If you run a commercial facility, you need to be dedicating money toward professional office cleaning services. You might not think of an office as being a particularly dirty place — not in the same sense a medical facility or gym might be, for example — but having that many people in an enclosed area can lead to a severe buildup of both dirt and germs. It’s no wonder that nearly 100% of workers say they’re worried about catching a virus at work. You can’t count on workers to regularly clean their own areas, either; nearly a third of participants in one survey said they thought their keyboards and phones were the dirtiest items in the office, yet fewer than 10% of them said they cleaned them often. That’s why all commercial areas need professional janitorial services in order to keep everyone safe and healthy.

You might be wondering at this point what the dirtiest areas in the typical office actually are. Here are the six worst, according to a study led by a University of Arizona professor and sponsored by Kimberly-Clark Professional. The results are based on swabbing and testing for adenosine triphosphate (ATP), a molecule that correlates with the presence of bacteria and viruses.

1. Faucet handles on breakroom sinks: 75% had ATP counts of 300 or higher, meaning they were dirty enough to make the risk of spreading disease extremely high.
2. Microwave door handles: 48% had ATP counts of 300 or higher.
3. Keyboards: 27% had ATP counts of 300 or higher.
4. Refrigerator door handles: 26% had ATP counts of 300 or higher.
5. Water fountain buttons: 23% had ATP counts of 300 or higher.
6. Vending machine buttons: 21% had ATP counts of 300 or higher.

Add to that previous findings that a desk can harbor 400 times as much bacteria as an average toilet seat, and you’ll never skimp on cleaning services again.

How do you currently handle cleaning for your workspace? Let us know in the comments.

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