droppings

Mice droppings on food

Q: My wife made rotis yesterday and placed them in a container. When they were cool she covered them. We had rotis for supper last night. After esha, when I was in the kitchen, I saw a mouse eating from a wrapped left-over sandwich. Later, I put the roti container in the fridge. After fijar, my wife took out the roti container from the fridge. She saw mice droppings or "stools" on the side of rotis in the container. 

1. What do we do with the rotis? 

2. What do we do if we have a mice problem?