In order to run legally, food service establishments are required to have a 3 Compartment Sink System, or commercial dishwashers working rightly.
The 3 compartment sink system is used for washing, rinsing, and sanitizing dishes and it's authorized by health departments.
1st sink to wash the dishes, (items must be scraped or soaked before washing them)
a 2nd sink to rinse the dishes,
and the 3rd one to sanitize them.
3 compartment sink systems should Not be used as a hand washer, or used as a mop sink, and the excess food ought be scraped off inside a trash can or other disposal.
The sinks should be rinsed and cleaned before and after using them.