Are these River otters? or*sea otters.
If they are the*river variety I feel your pain. a friend had them set up house in his 36' bay liner. He had to re-do the entire interior.
We have a lot of sea otters up here in Alaska. They haul out in the harbor and sleep on the fingers to the slips. they don't seem to go on land at all.
Also have you ever seen the poop from a sea otter? it is mostly broken up shells.
I looked at that and the first reaction was WOW!! That poor thing.
They must have some kind of protective coating on the poop shoot.
*Not only have I seen Otter poop, I have stepped in it. *And yes, it is a miracle of gastro intestinal fortitude, if not efficiency. *
I like the idea of ammonia as well. *I think I am going to sew up some bags of Gortex to put moth balls in. *That should help them last awhile in the rain and still be smelly to the otters. *Buckets over the cleats would be a bit of a nuisance, but maybe a good fall back plan. *
Thanks everyone! *Great ideas.