In a commercial setting, bacteria is often caused by dirty hands. Office workers can unknowingly spread germs on doorknobs, desks, and chairs. People also leave germs behind when they eat lunch in their offices and rarely wash their hands after visiting a public restroom.
Commercial cleaning staff cannot be expected to sanitize an entire office every day since that would be extremely time-consuming and costly. Instead, it’s better to encourage people to sanitize frequently so germs don’t have a chance to accumulate.
The best way to accomplish that is by getting everyone involved in proper hand hygiene through regular training sessions and posters or notices about hygiene protocol.