I have a covered boat dock. Spiders are a problem as they leave small black dots on the boat seat. Webs are everywhere. It is a wooden dock house. What do you recommend?
I keep a boat on Lake Lanier under a covered dock and have the same problem. I use a unique aerosol we sell called FS MP that penetrates and adheres to most all surfaces well Lightly mist using the crack and crevice straw the ceiling about the boat as well as any cracks or crevices they may be using on the boat. I find them on my anchor ropes, antenna, cup holders and more. FS MP works great on mud daubers too so I routinely spray all the air ducts and ports.
Since the droppings come from above, I attach the aerosol can to the top of a 14 foot extension pole and using the string pull cord, lightly mist these areas once a month. These treatments stop spiders and mud daubers from above too.
My ceiling isn’t too high so the 14 foot pole works fine for my needs but we also have a 30 FOOT EXTENSION POLE if needed. And for low lying ceilings, we have a short one measuring just 5-10 FOOT EXTENSION POLE.