Plug any holes with steel wool and spray foam insulation. I also put steel wool around the cord where it goes into the camper.

I gave up on the d-con after finding it hidden in lots of places. The even take it to their nests. I use Tom-cat and found a couple of small cracks that I plugged. Two winters in a roll with lots of droppings, then none last winter or this spring.
Tom-cat is blocks, that the nibble off because they cannot carry it away.

Not sure if it's a old wife's tale or true, but I've used fabric softener drier sheets spread liberally (lots of them) throughout my boat stored in the shed at the cabin in the winter. Haven't seen a single mouse turd in the 3 years I've been doing it. What I've been told is that the mice can't stand the smell and will nest elsewhere.

Plus, everything smells "springtime fresh" when I'm ready to put it back into service. For $1.50, it's worth a shot.

I must have used the wrong dryer sheets, because there were tracks and yellow markings on the dryer sheets that I had to pull out in the spring.

A number of years ago I was at a friends cabing and had to listen to his yearly rant about the mice. He couldn't figure out where they were coming in. I suggested that he take a can of baby powder and sprinkle it around the perimeter of the place. The tracks would show where they had been. He did it.

Well, the next spring he and his wife went up to the cabin. They found where the mice had come in, but they also found little white footprints all over the place. The powder had sort of 'set' over the winter and was a bit difficult to clean up. It didn't help that the Mrs. hadn't brought a vacumm along.

I still chuckle when I think of the look on their faces when they opened the door. One of my all time favorite pranks.

my 2 cents on this... cant say if dryer sheets work or not,
some people say they work. i might have to agree from what i
have seen in the field. one thing i did learn is dont put d-con
in the trailer unless you already have mice in there. why invite
them in? put around the outside. good discussion though!

randy

We've used dryer sheets for 3 out of the 4 winters in our camper (late Oct - mid April). No mice. But then again when we forgot one year we didn't have mice either. We put maybe 15-20 sheets around the perimeter and in&around bedding. Good luck.

I put dryer sheets and moth balls in my boat when I store it in my garage at my cabin in Wisconsin. I know I have mice in my garage as I caught over a dozen during the course of the winter in my traps baited with M&M's. (Superglue the M&M to the trap "flapper" it works great) They did not go in the boat however. No droppings, no chew spots etc.

I used my wife's old nylon to make small bags for mothballs and tossed them everywhere in the boat. I cannot stand the smell but it worked. I had drier sheets and Irish Spring soap last winter and they chewed on the soap ??? I think I was actually feeding the mice.

Anyway don't forget the electronics, I am using the ultrasonic repellent and they work the best, but you have to have power to it all winter, a small extension cord will work great.