I'm going to kick the grey mouse in the cage.
That will really hurt the mouse! Why would you do that?
They won't stay in the cage.
They are animals that naturally want to roam. You can't hurt them because of how they behave. You need to train them to stay in the cage with love and kindness and not pain.
It's a pain in the ass to have to clean up the room everyday. I have better things to do.
As a caretaker of these animals it's you're job to take care of them properly and make sure they are not hurt or injured. Maybe working with animals is not the right position for you and you should consider finding a different position?