Walking it the way a customer will
A cleaner who has worked a building for hours stops seeing it. Walking the customer route in the customer direction, at the end, with the trading lighting on, resets that. It reveals things invisible from a working position: a smear on glass that only shows from the doorway, a mark on a counter face rather than a counter top, dust on a display edge at eye height, a floor that looks different under downlights.
The lighting matters more than most people expect. Cleaning lighting and trading lighting are frequently different, and a floor that appears fine under one shows every streak under the other. Where a site's trading lights cannot be run during the attendance, the walk still helps, and the difference is noted so the cleaner knows which surfaces are unforgiving under the lights that will actually be on.
