We have a 2016 Seneca TS and one of the places we are frequently at has pack rats. Even overnight they will find their way into the basement storage areas. I will be cleaning these out, removing the interior panels separating these storage areas from the middle of the frame area and using spray foam to seal up all of the opening that I can. Does anyone have other useful advice on how to keep varmints out of the coach?
Rats can find their way to concrete seems like foam would be the easy part for them.
Just set traps or use an electronic device or feed them what is not good for their health.
I use an electronic device and a trap with peanut butter and check once and a while.
And If I find one in the trap and he's still alive I ask them if he did bring more family with him/her.
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Seal your holes then use peppermint oil, liberally. Place it on cotton balls in those storage areas. Like others have said, I would also use a baited trap to catch those that might enter. If you don't catch any, they're probably no longer coming in.
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Steel wool works, but bronze wool won't rust and they won't chew it.
Here's a bit more from a reviewer on Amazon. He's talking about mice but might be the same.
(1) Don't clean up mouse droppings. These are "hotspots" and the mice will return to them if they're left untouched.
(2) Get some poison blocks (I like "Havoc XT") and three inch wood screws (you might need some washers).
(3) Put three Havoc XT cubes on a woodscrew and secure it in to the floor/wall (whatever) where the dropping are.
(4) Replace the cubes once a week until the mice stop feeding; it may take up to a month. In bad spots, you might need to put 2x or 3x poison.
(5) Search the area around your hotspots for entry points... plumbing pipes/drains are a major culprit, but I've seen bad/amateur electrical work on exterior walls that punched right in to the vent space.
(6) Fill holes/gaps *generously* (push the applicator straw in to the hole, spray for 2-3s, then continue spraying while slowly withdrawing. The can is single use, so go ahead and use it all. You'll want to wear gloves and safety glasses. as the stuff is impossible to get off your skin.