Spider prevention?

Aug 2, 2018
96
Beneteau Oceanis 40cc Little River, SC
We keep our boat slipped at a marina on a lake in the Midwest. As the summer has progressed, I’ve increasingly encountered spiders on the boat after a week or sometimes two between sailing outings. The last time they were everywhere topside. Harmless (I think/hope!), but super annoying... mainly because they make webs everywhere.

Anybody know of a good product, not harmful to people and not (too) bad for the environment, for keeping spiders from making their home one the boat?
Whenever we are in a marina but any amount of time we always seem to accumulate bugs on board. Sometimes it's roaches EEEEK! or spiders or even ants. So as soon as we moored in a different location we always spray our ropes lines. It stops the little boogers from getting on board because after all they have to crawl down the dock lines to get on!
Cara
 

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
23,141
CAL 35 Cruiser #21 moored EVERETT WA
Here is what I've been told they use to stop the spiders in Central American ports from coming aboard.
rat-spider guard.jpg
 
Feb 3, 2015
299
Marlow Hunter 37 Reefpoint Marina Racine, WI
Our spiders here would go up the line, grab the disk in their fangs and tear it off. They would’ve then continue up to the deck while the boat lists heavily. A well placed rpg almost always takes them down.