They do regular cleans.
I stopped doing the one offs some years ago as I had to get involved too much myself to get the quality. As you probably aware it can be real tough.
These are part timers, at one time a good few years back I got up to 28 part timers but nowit doesnt appeal to me employing people even though the ones I have are good and been with me for some time now - minimum is about 6 years, one about 18 years.