@Patricia3334
Many guests are clean and orderly. Others not. Obviously we're all delighted when they leave the place spotless. But some do, some don't. It's just the nature of the beast.
I don't bother confronting the guests about this. It's just begging for a retaliatory review. Just smile and thank them for staying at your place, and then write the truth in their review. Just the facts, no emotion.
It's all you've (we've) got. And it will warn other hosts, just as you'd like to have seen in their profile when they requested to book. If you have instant book, then if your review reflects their actual behaviour and you tick the "would not host again" box, then they'll no longer qualify for instant book when the host has all the IB filters on, which I'd highly recommend.
This is how the review system is supposed to work. Please use it properly for the sake of all hosts, including yourself.