Why the cleaner should not be the decision maker
The person asking is usually being reasonable and the cleaner usually wants to help, which is precisely the problem. A cleaner has no way of knowing whether the request is already covered elsewhere, whether it displaces something the client has paid for, or whether the person asking has any authority to change the arrangement. Putting that decision on them is unfair and it produces inconsistent answers across a building.
It also creates an expectation that outlasts the individual. A cleaner who agrees to empty an extra bin has created an ongoing obligation that the next cleaner will be judged against and will not know exists. Multiply that over a year and the actual service delivered has drifted well away from the agreed one, with nobody having decided anything and no record of how it happened.
