Use traps. Not poison. Poisoned rodents will crawl into a small space
and die, stinking up your boat.

Make sure to put paper under the trap to catch body fluids.

Peanut Butter makes an irresistible bait. Check traps frequently, but DO
NOT HANDLE THEM. Use rubber gloves when removing from the packaging, or
removing used traps & dead rodents. Your scent will warn off the
critters. Do not re-use a trap, as the scent of the dead rodent will
warn other rats.

Capt. Frank

Fred wrote:

When storing a boat over the winter, what is the best way to make sure mice
don't chew up anything?