How do you naturally repel mice from a camper?

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We just purchased a really nice 23 ft. pull-behind camper that is going to sit in our unheated barn this winter. I want to make sure mice don't get in and make a home out of it. Any natural ideas on how to keep the mice out? I prefer not to get the regular rat poison as I will not be checking on the camper throughout the winter and I don't want mice to die in it and leave a bad smell all winter that's going to be impossible to get out.

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