This stuff looks like innocent white powder. It’s actually tiny fossilized skeletons with razor-sharp edges.
Sprinkle a thin line of food-grade diatomaceous earth along baseboards and behind furniture. When a spider crawls through it, the powder slices their exoskeleton.
They dry out. They die. It’s metal, but it’s also completely non-toxic to you and your pets. Just don’t snort it. Use a mask when you sprinkle.
How to Get Rid Of Spiders Naturally