Always seems to be the way
When I moved out of my flat in London they wanted to take over £100 to "professionally deep clean the bathroom" due to it showing "months of neglect" - they'd had someone in to rip out and replace the whole bathroom shortly before we moved out and it was absolutely spotless - I'd barely even used it as I'd made arrangements to be elsewhere while they did the work. When confronted over that they said there had been a "mix up" and came back with a load of other stuff all equally dubious. Got almost all of it back in the end but it was hassle.
EDIT: I gave them a bit of rope to hang themselves with so to speak over the bathroom so it definitely wasn't a mix up - blatantly trying to recoup some of the cost of redoing it IMO.