I look after my dads flats in the summer and we have this quite often. One flat in question was left pretty tidy, floors and tops were clean, but the walls and stuff were really dirty and on the doors where you grab them when there half open there was dirty marks, not loads, just enough to notice, and the walls had loads of dirt marks on them. These are top end new build flats so they all needed to be immaculate before the next tenants move in. The pretens could have spent a couple of hours with a wet cloth rubbing them off, but prob either couldnt be bothered or more likely didnt think they were that bad. It answer to your question depends how you left the place, and some peoples idea of clean if very different to other peoples. If you were a common tenant, you have probably lost that deposit there is very little legal legislation protecting common tenants, if you were a private tenant you need proof that you cleaned it, pictures and stuff. The other thing is to offer (which is what we do) is to go round with her, and she can show you where it was dirty and you offer to clean it, or source your own cleaner? Good luck!