People had already done Poliotus on the floor and it was now so shiny that he was in danger of slipping on it.

"Pretty sure that's a hazard," he muttered under his breath.

But he still had to practice the charm anyway so Ryan grabbed his trusty wand and walked over to a patch of floor in the corner of the classroom. Waving his wand in an S-shape again, he said, "Poliotus" and watched for any difference. Nothing happened, or if it did, he didn't see it because the floor was already so clean. Shrugging his shoulders, he deemed the floor clean enough and moved over to the windows.