I would be one of those people. The ones that leave it to the new owners. I have tried to leave places clean but I know people would come in and clean it again anyway. I think everyone has different standards and some of you would be horrified by mine. I am not exaggerating, I can see dust behind this monitor that has probably been there for years as I can't reach it easily.
In fact, when we left our last house, we were running very late and didn't have time to clean where the wardrobes, boxes and cupboards had been. The new owner asked us to go back and clean up as there was mould on the carpets and the walls (we didn't know as it was behind all wardrobes and cupboards). It did look awful.
We did our best to clean it up for him. Now I think we would have told him he'd bought the house and it was his problem!
In fact, when we left our last house, we were running very late and didn't have time to clean where the wardrobes, boxes and cupboards had been. The new owner asked us to go back and clean up as there was mould on the carpets and the walls (we didn't know as it was behind all wardrobes and cupboards). It did look awful.
We did our best to clean it up for him. Now I think we would have told him he'd bought the house and it was his problem!