I prefer natural means of controlling spiders. Chemicals are not my cup of tea.
I set those sticky traps inside our house. They catch a lot of interesting creepy crawlers such as flies, gnats, wolf spiders, silver fish, or an occasional earwig or centipede (those two are rare). Sometimes, we will catch a black widow spider, but they are very elusive and often spin a web next the the light in my Victor Flea trap (the Ultimate circular one that has a dome).
I have noticed that certain spitter spiders with very long legs have an appetite for black widow spiders. Whenever we find one of these long-legged spiders, we carefully relocate it.
Since we are encouraging these spiders to settle around our property, the population of black widows has decreased.
There are those blue mud dabbers who also like to capture spiders to feed their young.
Once while waiting for my son to finish his Karate class, I sat outside and watched a deadly battle between a huge black widow spider and some yellow jackets. She would spin her web adjacent to a water sprinkler. Then she would wait with her red hour glass visible. A yellow jacket would spot the red and zero in on it. She would suddenly drop, and then the wasp would get caught in her web. Immediately she would circle it carefully while enclosing it in a web cocoon. Next, she would deliver some careful bites. Paralysis would set in very quickly and then enable her to drop it to the ground where she had a pile of these cocoons stored. In about 5 minutes, the deed was done, and she would resume her position awaiting her next victim. She would succeed in capturing about one yellow jacket every 5 to 7 minutes.