I'd check for any entry points that you could eliminate first, and use the peppermint oil spray. We spray around the outside of the trailer, as well as inside. We use a stronger solution on the outside. We don't keep food in the trailer as well. We live right next to fields, and so far haven't had any mice.
Outs sits in a field which we keep mowed to try to discourage the mice. I’ll try spraying outside too. One we get a roof built over it that would allow the spray to last longer. Thanks!
You need "Pure essential Peppermint oil" not food grade or spray. Put 3-5 drops on one or two cotton balls in an old coffee mug. Do not get on floors or countertops. Replenish every 6 weeks or so.
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