A long time ago there was quite a discussion about what would discourage birds from pooping on our Dories kept in boathouses, also mud dauber bees, spiders, and various tiny reptiles (microsauruses).
Against the birds, what I finally hit on was CDs. I ran a long strip torn from an old sheet through the hole of each old CD and tied a knot, so they are horizontal, then tied another knot about halfway down, both so they swoop around more unpredictably, even in the slightest breeze. I used three in all.
For evicting spiders, bees, wasps, and lizards, a neighbor turned me on to giving all the wood in the ceiling a fair soaking with diluted Pinesol. With the boat moved out for an hour, I used a little pump-up garden sprayer, well-rinsed first of course. Pinesol is also way less toxic than insecticide, as the wind will spray some back on you.
Did those tricks work? Absolutely, with not one spot, big and white, nor tiny and black, in five months, though I may have to redo the Pinesol one day. "Your mileage may vary", but I'm sold.
Against the birds, what I finally hit on was CDs. I ran a long strip torn from an old sheet through the hole of each old CD and tied a knot, so they are horizontal, then tied another knot about halfway down, both so they swoop around more unpredictably, even in the slightest breeze. I used three in all.
For evicting spiders, bees, wasps, and lizards, a neighbor turned me on to giving all the wood in the ceiling a fair soaking with diluted Pinesol. With the boat moved out for an hour, I used a little pump-up garden sprayer, well-rinsed first of course. Pinesol is also way less toxic than insecticide, as the wind will spray some back on you.
Did those tricks work? Absolutely, with not one spot, big and white, nor tiny and black, in five months, though I may have to redo the Pinesol one day. "Your mileage may vary", but I'm sold.