Has anyone hired a commercial cleaner in the past? If so, how did you choose the right cleaning company? What was important for you when looking for a commercial cleaner? Also, what where the things they did to added value for you and your company?
Other insight you can provide into purchasing this type of service would be appreciated.
My wife's experience with hiring this type of service was that in the beginning each cleaner was great, but then appeared to degrade/slack off. That may just be a perception issue though.
I would ask about how they ensure consistent quality over time.
Be clear about expectations and requirements/things to do.
I suggest you have a specific checklist that they check/initial so you know everything has been done. This will help to prevent cleaners from starting strong and then having the amount/quality of services depreciate over time. Also, you won't have to remind them and answer to "Oh, I didn't know if I was supposed to do that." And it's easy to add or remove items from your personal checklist.