Ever wonder how they clean the outside windows of really tall buildings in the city?

Well, I found out yesterday!

As I was walking back to the studio, I saw someone tethered to the top of One City Center, and he looked like he was rappelling down the side of the building. He wasn't really moving... then I noticed that he was washing the windows!

Now I know how they do it. I think they started at the top, because ours still needs a good scrubbing! I think the last time that happened was back in 2015: