Walked down "Tunnel Street" for the first time since the Times ran that piece about it. It was about as spotless as a New York City tunnel could hope to be (not a peep, D.C. Metro), and there were crews painting the floor gray. (Why? Maybe because dirt doesn't look so bad on gray.) There was still graffiti on the walls, but overall, it felt like an improvement.
UPDATE 2: After a full day of use, there were less than half a dozen pieces of trash scattered along the route.