The first judgement is safety, not cleaning
A cleaner should not be working underneath an elevated work platform, inside a barricaded zone, or in an area where a trade has isolated power or is producing dust. That is not a preference; it is the reason those controls exist. The correct response to finding a trade at work in an area is to stay out of it and to find out from the trade supervisor what is excluded and for how long.
That conversation takes two minutes and it is the most valuable part of the night. It tells the cleaner which areas are actually available, whether the work will finish during the shift, and whether there will be debris to clear afterwards. Without it the crew is guessing, and guessing on a site with plant movement and live trades work is exactly the wrong approach. It also puts the cleaner on the trade supervisor's radar, which matters if conditions change.
