Bear in mind the biggest predator of spiders is probably wasps, depending what part of the world you are in. Be careful of getting rid of all the wasps.
Hobson’s choice. 😊
If you can figure out what the spiders are eating that may get you closer. If it’s flying insects, check if you have any light, even infrared light, maybe even warm electronics up in those places that might attract flying insects. If it’s crawling insects an insecticide barrier may stop their food source.
But I find webs even where there’s just no light and seemingly no insects. Tenacious little critters.
Nanobots needed (and a NINA plugin to control them).