The soil sits above the floor
A goods corridor collects black rubber marking at wheel height, hand marks around door furniture, and scuffing on every internal corner where a cage turns. None of that responds to floor cleaning, and none of it improves with a higher floor frequency. It is the single most common gap in a back-of-house specification, largely because corridors are written into scopes as floor areas. Cleaners follow what is written, and what is written describes a floor.
Adding wall surfaces to the scope changes the appearance of the whole route for very little additional time. A periodic pass on skirtings, corner guards and door frames with an appropriate product removes most of the marking, and a shorter interval on the worst corners keeps it in check. Where a wall finish has been damaged rather than marked, cleaning will not recover it and the scope should say so.
