@ossobuco,
Why are these spiders inside your house? We have all kinds of creepy things here in TX Hill Country but haven't seen black widows. This house had been vacant for awhile when we bought it, following a flood in June and a drought in fall that year. So, ooo, first thing was a big TX half-dead roach climbing up the side of the patio wall. I had never seen those things before. They live outdoors, but...you know, some have them inside. We have Pestmaster come out 5 times year and that takes care of those. Plus, I am a spraying maniac so I keep the Home Depot huge size family sprayer handy.
We don't get any bugs in the house because they spray 4 ft. out and 4ft. up outside and in attic, or anywhere else I ask them to. Under the oaks where we've had to coax a ton of boulders out of the ground. This is also for fire ants, any kind of ants. We won't get anything long as we spray 5x year, all around house. Hope these people will do this for you.
Tell you something funny. Last October it had been raining hard, when I went out on the front porch I (always d0) looked behind my pots sitting there and there was this HUGE spider, as big as a man's fist. God. So, took a broom and pushed gently. He was dead? I shoved him in a jar, kept him for an hour and threw the thing out. It wasn't until just last month that, for some reason, I just realized this could not have been alive. I think it was one of those fake rubber, or whatever, spiders from the kids at Halloween. I remembered that he didn't smash, sorta gently sprung up again. Rubber spider made in China.
Gosh, I'm sorry you have spiders inside the house. If I was there I would come over with my new bug spray. You get about an ounce ($8 premetherin) and it makes a gallon or two. Deadly. I think we mixed it too strong couple months ago. All the ants climbed the trees and got into my bird house, five of them. So, that is what happened to my little house wrens. But, we have NO bugs. Well, one scorpion. I think you are very brave.
You just need a 2 gal. sprayer (cheap) but I think the Home Depot 2 gal. sprayer (it's already filled) would suffice for inside, maybe outside too but I don't know.
Sleep well, Osso, nothing will ever bother a nice person like you. Scheese, what a long post.