Just that really. I've recently moved and my former letting agents have said I've left the flat in a mess. (I haven't, but that's another thread).
They're now saying they'll have to get quotes for professional cleaning and I'll be charged 10% of my deposit for that. And then whatever it costs for the professional clean on top.
That's if they bother to get it done. I know from the previous tenants they charged a huge amount for cleaning and other things and then didn't get any of the quoted for work carried out.