Now this was the sort of activity Mo could really get behind. He watched his classmates move off to begin their cleaning tasks with a fair amount of glee before choosing his own little corner of the world to clean. Like... perhaps, one of these deeply set windows. They were smaller and not particularly good at providing light, but they needed cleaning just like everything else.

Where to start, though? It seemed pointless to just start polishing when the glass was thick with dirt. He pointed his wand at the window and muttered, "Scourgify." The glass was much much cleaner now, albeit still streaky and impossible to see through clearly.

Still, while he was at it... "Scourgify. Scourgify." Mo cleaned off the deep sill and around the window pane, revealing the glass was set into darkly burnished metal. Ick. Rust-coated and miserable looking.