Start with the periodic programme, not the daily work
Daily work is self-policing to a degree, because people notice when a room is dirty. Periodic work is not, and it is where an annual review finds most of what it finds. Take the periodic list from the scope, put the stated interval next to each item, and ask when it was last performed. Anything that has slipped a cycle or was never scheduled will show up in ten minutes.
Expect a mixed result. Some items will have been done and never recorded, which is a reporting problem. Some will have been quietly dropped because they were difficult to schedule, which is a planning problem. A few will turn out to be unnecessary, and removing them is a legitimate outcome of the review rather than a concession by either party. Recording the outcome against each item takes a few minutes and gives next year a starting point.
