So yes it is still friggin cold, which means some of the ice and snow is still on the sidewalk. Some good citizens shoveled their (and maybe their neighbors’) sidewalks. And there were others, who did not shovel, or deice their sidewalks. For the safety of pedestrians and neighbors please remove the ice. 
There used to be a thing on my DC 311 app for shoveling enforcement, however right now the only thing I can find is the exemption for snow shoveling for senior citizens. It’s the old ClickFix app and I have yet to sign up with the one created by the city. But I see the city one does have something to complain about unshoveled sidewalks. The web version, under all city services, does have “Snow Removal Complaints for Sidewalks”.