Moth balls spread around the barn, inside and out, including inside the toys. I also use them in some old part cars and trucks stored out side.

Couple of out side cats that can't get into the barn also help.

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!