Sand as an abrasive, not as dirt
A vinyl or sealed floor loses its finish where sand is present under foot traffic, because each step grinds particles against the surface. The wear pattern follows the traffic line and appears as dulling long before anyone would describe the floor as dirty. By the time it is obvious, the finish is gone and the remedy is a restorative treatment rather than a cleaning adjustment.
The practical response is frequency at the entry rather than intensity across the floor. Removing grit before it is walked in preserves the finish; removing it after it has been ground in preserves nothing. That is why the useful measure on a coastal site is how often the first few metres are cleared, not how often the whole floor is mopped. Reviewing the traffic line after a few months gives early notice of finish loss, which is far cheaper to address than a full restorative treatment.
