What a cleaner is actually exposed to
Papers left on desks, whiteboards with unerased content, documents in open bins, screens left unlocked, printed material sitting in output trays, and meeting rooms where the last session's notes are still visible. In most offices this is the normal end-of-day state rather than an exception, and the cleaner encounters all of it in a building with nobody else present. Add to that the printer output tray, which in many offices holds documents nobody collected before leaving for the weekend.
The point is not that cleaners are a risk. It is that an organisation with strict digital controls and an office that empties without a clear-desk habit has built an expensive control around one route and left another open. Recognising that reframes the issue from vetting individuals to managing exposure, which is both more effective and more respectful of the people doing the work.
