I use mothballs in all outside storage bins which works great at keeping insects and mice away. I also have a screen over my furnace exhaust...search RV furnace screen on Amazon...about $12.00 and works great.
The moth balls have 2 bags in a box and I just just place a bag in every access area around the RV. I even placed a couple under the hood when storing for the winter. After my problems from last winter I now place them in the generator compartment as well.
I started using the moth balls years ago to keep the mice out but have found they also keep all insects out.
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