Sleet at midnight along the Navy Yard wall is its own particular kind of miserable, and it is exactly when the work begins. Clean Care Tech clears commercial ground on nights like that — lots plowed and the piles set where they block nothing, gates and walkways shoveled, salt down on the approaches before the first shift arrives. In Vinegar Hill the old granite blocks hold ice in their seams, so the crews go back over ground they have already covered. Nobody thanks you for a parking lot that is simply bare, and bare is the point. Snow removal, ice control and de-icing in Brooklyn and nearby.