Each workday morning, Debbie Johns drives her 23-year-old Ford Probe a little more than two miles from her lifelong Mount Airy home to Chestnut Hill Hospital, where she clocks in for her 7 a.m.-to-3:30 p.m. shift. On the cobblestone sidewalk outside the hospital, scrawled in pastel-colored chalk, are the words: “Because of You, We Have Hope." At the entrance, there’s a big, hand-painted wooden sign in blue, dug deep into the grass: “Heroes Work Here.” Johns is a hospital housekeeper, and she’s one of many on cleaners on the frontlines of stopping the spread of the coronavirus.