I've been hearing this ad too, Robin, and was thinking that it just wouldn't work in my house. The one window which gives a really clear view inside, is my kitchen window, where my sink is. If they heard sounds of washing up with no-one standing at the sink, they would KNOW nobody was home.

I would have thought the sound of a TV and voices in conversation would work better.

On the other hand, my friends' CD of hurdy gurdy and pipes played loud might slow them down a little :-)