I give my girls mounds of hay and place it on the floor. My girls spread it everywhere but I try not to get OCD about it. I have a large cage so they only wee and poo in certain areas which I change twice daily. I also have pee pads in those areas. The remainder of the area is changed and washed once a week, after a thorough shake. But I leave the hay where it is. I try not to get stressed about it. The girls may like it there for later maybe. As long as its not dirty, it stays there until weekly clean. I just tell myself Hay is OK and don't stress about it. I discovered trying to keep hay in one area is a futile exercise.