Spider patrol...
Every time I get down to the boat, I take a deck tour to see where webs are. After dark, giving the buggers time to reoccupy or restring their nets, I hit the deck with a flashlight and a can of flying insect spray. Every boarder I find gets a shot of "gas" and I watch them drop to the deck. The ones as big as my thumb take two or three shots. In the morning I clean up the webs with a spoke wheel brush (an oversized bottle brush for you younguns), hose off the deck, and enjoy the rest of the day spider free. Home Defense sprayed around under the toe rail lasts only about two weeks then it's back to the patrol routine to clean out the newcomers. Even boats on our marina moorings have spider boarders. This year seems milder so far.