Tracing the paths grease actually takes
The route out of a food tenancy is the first thing to map. Staff carrying waste to the bin store leave a trail along a specific corridor. Delivery paths bring different residue in. Air movement near an exhaust or a service door deposits a fine film on nearby surfaces that ordinary detergent will not lift. These paths are usually obvious once someone walks them looking for the pattern rather than for general untidiness.
Once identified, they become their own scope line. A corridor carrying waste traffic needs a degreasing routine rather than a neutral detergent pass, and it needs it more often than the corridor twenty metres away. Applying the heavier method building-wide is wasteful and unnecessary. Applying the lighter method everywhere means the affected path stays slippery and marked no matter how often it is done.
