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The first thing you have to do is remove their food sources - any seed, dog/cat food etc. If you have to store it there, get plastic bins with screw tops to keep the mice out. If you don't mice will return again and again.


Everything is a food source to a rat. I had this problem and took everything I considered food out of the garage. They just started eating everything else. They even ate the motor oil plastic bottles, which sure made me wish I had left the cat food in there for them.