The need for staff knowing about bloodborne pathogens and the inherent risks thereof is very important, not just for the sake of cleanliness but also for the wellbeing of everyone at the workplace, whether they're employees or customers. Even a small amount of blood has the potential of infecting someone with Hepatitis B, HIV, etc. 

All Staff should also be aware of the OSHA and CDC guidelines, they exist to keep everyone as safe as possible from sickness or even death. regardless of what job we may do, our number one concern is health and safety, and we all want to go home every day and avoid a trip to the hospital.

And lastly, as janitors specifically we are on the frontlines in this, it's our job to limit exposure to dangerous pathogens, and we want to keep our workplaces as clean as we possibly can, ultimately for the wellbeing of everyone involved.