After hours the business lots along Erie Parkway go quiet and wide, and a snowfall turns every one of them into a blank page. MG Cleaning Systems reads them at three in the morning — plowing the lanes, stacking piles where they will not block a sightline, shoveling entries and treating the ice that forms at every doorway. Storms come across the plains fast enough that the work is often done twice before sunrise. By the time the first car turns in, the lot has its curbs back, its stripes back, and a clear path to the door. Nobody sees the night's work, which is precisely the measure of it.