Mice are usually very clean and tidy animals and usually have a special place or potty corner. This corner should be clean regularly to eliminate mousy smell. Most mice learn to use a potty box, which is a small bowl filled with kitty litter.
Having this box, it will be easy to clean daily and fill with clean litter. You should clean you mouse tank or cage at least once a week, preferably more often.
Usually the mouse owner’s nose tells when mouse tank isn’t cleaned often enough. Wash the tank or cage using shower and brush and mild dishwashing solution.
Check your mouse everyday. Mice are short-lived little animals and their illnesses break quickly. A mouse that is fine and happy in the evening can be all sick and hunched up, with coat standing up, sitting in the corner of the cage.
All the best for to your darlings!