Empty “pop” cans stuffed in their nests worked for us. We kept a tarp thrown over the boat,We're in one for a 19 footer, so I guess a small one. I've heard about the birds, is there anything you can do about this?
Thats how my Dad (icemaker) used to do it as well, every spring the swallows would nest,,, out come the stick and hook, bye bye birdies. did that for 50 plus years in a boat house at Norms Bayview then changed to Marina shores.If they got in, my grandfather used to just knock the nests out of the rafters and into the drink eggs and all. But that was way back when Archie Bunker's words of wisdom didn't offend anyone