Directly employed teams, published schedules and photo-evidenced audits. If you are chasing your cleaner, the contract is broken.
The difference between a good and a bad cleaning contract is visibility. You should know who is on site, what they are contracted to do and when it was last checked.
We employ our teams directly, publish the schedule of works, and run supervisor audits with photographic evidence attached to a monthly score.
Cover is the other test. Illness happens; a four-hour cover response is what stops it becoming your problem.
Facilities managers should never be the first to notice a missed clean. If they are, the reporting is wrong.