A clean workspace supports employee wellbeing and leaves a lasting impression on clients. But consistency is the hard part, and consistency comes from systems, not effort.
Look for documented checklists, regular inspections, uniformed and ID-tagged staff, and reporting after every clean. These are the signals of an operator who will still be excellent in month twelve.
The best cleaners make themselves accountable. If you never have to chase them, you have found the right one.