Glory
You're keeping the world clean and healthy through your daily battle against the evils of grime and contaminants. You're a soldier with a spray bottle—and hundreds or even thousands of people owe you their health.
If you're working in a place that has kids, elderly, or sick folks (like a school or a hospital), then that goes double. Those people are extra-susceptible to disease. If the knowledge that you're keeping hundreds of people safe and healthy doesn't make you feel glorious, then there's a good chance that nothing else in this job will.