Mo moved down the window, now that the top was clean. Each subsequent "Vitrumonia", left another square of window clean and shining, until that part of the room was considerably better lit by the natural daylight streaming through. Once again, Mo leaned forward and pressed his eye to the glass, and he was pleased to discover that he could see green and blue and brown through the thick glass. Still not clear, but then this type of glass never really was.

Oh, but now there was smudge from where his face had been pressed, and Mo pointed his wand again and murmured, "Vitrumonia." Now all the glass was clean, without even fingerprints or smudges, and Mo stepped back to admire her work. Perfect.

Now... to get the frame clean.