Some suggestions for glider storage.
Find and seal the cracks and holes in your trailer.
At night, put a bright light bulb inside your trailer. Close lids and
doors.
Roll underneath and mark anywhere you see light coming through the
trailer.
Seal everything, even the smallest openings. This also helps keep
road dust out of your trailer.
Remove the edible cushions and any accessible wiring if possible.
Don't leave any food crumbs or liquids in the cockpit -- ever!

Decon pellets is a brand of mouse poison found in the USA.
After they eat the little green pellets, mice get dehydrated and
hopefully go outside to find water and do not die inside your trailer.
An undisturbed box of Decon is a indication you do not have mice.
Scattered Decon pellets will indicate mice.

Store the trailer inside a building if you can. Might be worth the
extra expense.

In Texas, mice may attract snakes, so we try our best to sabotage the
food chain!
So far, no snakes inside . . . but we know they are out there.

Burt
Marfa Gliders Soaring Center, west Texas
USA