If you check my posts, I have dropped a cotton ball with peppermint oil in a cage of mice and they walked right over top if it.
Not to mention, MANY people here have had failures with it.
Because you have no mice and put peppermint oil in your trailer means nothing. You can't prove a negative. you call it FACT because you havent had mice? LOL
If you take out the peppermint oil out and use garden rocks in your trailer, does that mean garden rocks are a mouse deterrent?
As well, mice live in trash, sewers garbage dumps. Do you really think the smell of peppermints is going to scare them away?:R