If you have any mouse droppings in your house the first need is to get rid of any infestation. You may need the help of a professional exterminator. But cleaning up the droppings itself takes a little know-how. These droppings have a lot of germs and should be handled carefully.
Wearing rubber gloves, pick up the droppings with a paper towel and dispose of them. Then spray the surface where the droppings were with disinfectant or a bleach solution (10% bleach in water is recommended). Alcohol also works–a 70% strength is recommended. Then wash the surface.