Ethan moved away from the now clean corner of the wall and walked along the length of the classroom. It was starting to shape up from the work of the students and he looked for another place to clean. He came across another dirty window and turned his attention to it. Perfect opportunity to practice the glass cleaning charm, one that he found to be rather useful as opposed to the more superficial polishing charm.

He stood in front of the dirty window, noticing the caked dust in the corners of the pane and he pulled out his wand. Starting at the top, he swiped it in a line down the uppermost part of the window. "Vitrumonia!" The 17 year old smiled a bit as he noticed the sun now shining through the crystal clear window pane. He did the same to the bottom, pulling the wand down in a straight line and commanding, "Vitrumonia!" And now the rest of the window shone perfectly clear. Time to move on to another dirty spot in the room.