What actually changes at the door
Three things dominate. Matting stops working once it is saturated, and a saturated mat moves water further into the building rather than capturing it. Grit tracked in during dry windy weather behaves like sandpaper on a polished floor and needs removing before it is walked in. And the transition strip just inside the door collects both, which is why it is the first place an entrance starts to look neglected even when the main floor is clean.
The response to each is different. Saturated matting needs lifting, the floor beneath needs drying, and where the site has spare matting it is swapped rather than left down. Grit needs sweeping or vacuuming before any wet method is used, since mopping grit simply distributes it. The transition strip needs a deliberate pass rather than being caught by whatever the mop happens to reach. Each of the three needs its own action, and doing one of them well does not cover the others.
