Defining the levels by situation, not by seniority
A ladder built on seniority produces hesitation, because the cleaner has to judge how serious something is before deciding who to trouble. A ladder built on situation removes that: anything affecting safety or the security of the building goes to the client contact immediately regardless of the hour, anything about the work or the arrangement goes to the supervisor, and anything within the role is simply done and recorded.
Written that way it can be followed without judgement at eleven at night, which is when it will be needed. It also stops the common failure where a cleaner decides something is not important enough to call about, and the client discovers at eight the following morning that a door was found open at nine the previous evening and nobody was told. Removing judgement is the point, because judgement at eleven at night is unreliable.
