Half past four on a January morning, and the ridge above Sprain Brook holds nothing but blue shadow and the hum of a streetlight. That is the hour Tiger Clean Window Cleaning is already out in Greenburgh, headlights swinging up driveways that pitch down hard toward the road. Westchester snow comes in heavy and wet off the river, and it sets like mortar if you let it sit — so the plow goes early, shovels follow to the steps and the front walk, and salt goes down before anyone has reached for a coat. By sunrise the pavement is dark and dry, edges cut sharp against the white, and a whole street can get on with its day. There is a real satisfaction in a driveway opened before the people who use it ever had to think about it.