What does the vetting process look like when contracting a cleaning services?

[Christopher Matthews]

When looking to bring on a routine cleaning services to manage the maintenance of a property, what should that vetting process look like? I just started a side cleaning service (which has the manpower to cover larger commercial needs) with my business partner and I'm interested to learn more about what types of questions or materials (i.e referrals, testimonials, work experience) we should have prepared or expect ahead of a consultation? Any advice would be much appreciated!

Thank you!