Find the source of their entry into your home.
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I have a 35 foot travel trailer with sliders on both sides that expand the interior space. I’ve been trying to figure out how to stop the mice from coming in for the last 8 years without success. I’m sure it is around one of the sliders but the seal looks to be tight all around both when the sliders are in or out. I’m thinking about using one of the sonic devices but I normally switch the power off all winter. What I typically end up doing when closing down in the late fall is a mix of things that get put under the camper.... multi-catch mouse traps, glue traps and Tomcat mouse poison.
I tell ya, opening up the trailer in the spring is always ‘interesting’ to see what surprises might be found there. I sure would like to figure this one out..... not sure what I’m going to do.
This worked for me, no cat available, many years ago...
Placed a couple of planks across kitchen from counter to table, but they didn’t quite join up, paper towel made it look like a bridge was there ... pail was set below paper towel and it caught the offending party. I was in a humane mood and only put a small amount of water in pail to cushion the fall. A live mouse was found the next morning, unable to get out of pail, and was escorted out of the O’Donnellate to join the rest of the natural kingdom in their intended environment.
Fun, but a cat is a better solution. If less humane, you can fill pail with water, mice don’t swim.