Hi, personally we think its the perfume in the sheet itself as we use just about any dryer sheet that we have on hand. we also (this might sound strange) take two boxes of moth balls and scatter them on the ground underneath the trailer when we put it into storage...this way it doesnt affect the smell of the inside of your trailer but keeps away those pesky critters during the winter months. have been doing this since 2003 and never had a mouse problem...and we live on a farm. hope this helps!
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Kevin & Dayle
2011 Cruiser CF32MK
2003 Chevy Duramax Crew
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