Cleaning the floor is a delicate matter. Use this on this surface; use that on that surface. I was using the wrong this on the wrong that, and when K returned from shopping with the Boy tonight, she informed me in no uncertain terms that I was not to be using this with that. The Boy was standing and watching. When K walked away, he was kind enough to make sure I understood it perfectly:

“No, Tata, no!” he said, finger wagging. “Don’t use this here. No Tata!”