The morning after a Concord storm has a particular stillness — Horseshoe Pond flat and white, the traffic muffled, every surface waiting to be uncovered. North American Exterior Cleaning treats snow the way it treats any other layer that does not belong: something to be taken off cleanly, right down to what lies underneath. Drives get plowed wide, walks and entries get shoveled out, and the ice that forms in the shade of a north wall gets dealt with instead of ignored. Half-cleared is the part that trips people. A property opened properly stays open, and the people who live there can walk out without watching their feet.