I agree also that sparkys are the worst offenders. What is it with them to think it's funny letting all there ends of stripped cable fall into the empty grout joints. The sparky I used to use didn't give a stuff when I told him to stop doing this. Lets just say he got upset when I opened the window and threw his tool pouch out, he couldn't believe that I did it, I just said to him that I found that funny so just @@@@ off. I now have another sparky who is pretty good to be honest.