Andre Silas has been a Downtown Ambassador for a year and for the entire time he’s been doing one job: pressure-washing the sidewalks. “I love it. To me, it’s keeping the city clean,” said Silas, who is employed by Service Group Inc., the cleaning service hired by Downtown Vision Inc. to keep the 90-square-block area DVI services clean. Wednesday morning, Silas was working on Newnan Street across from the Florida Theatre and Bailey Publishing. In the afternoon, he was pressure-washing the sidewalks in front of the Cecil Powell building.