They had left spots on a window and I'd asked them to go back upstairs and clean it so it was fully clean. They said the spots weren't coming off easily, but they went back up to finish the job properly, upon my insistence. However, when I checked later, after they were gone, I discovered that the glass was now cracked. It was a single-pane window in a historical house, which now has a hairline crack through it. I was disappointed because I'd seen their signs all over the neighborhood. Come to think of it, I haven't noticed their signs up, outside people's homes -- at least not as frequently as I used to. I wonder if this is a reflection of the fact that perhaps others have had similar problems? Or maybe I now have a tendency to tune out their signs.