Contact Sprays: A non-residual aerosol insecticide can be sprayed directly on brown recluse spiders to eliminate live invaders. This treatment is a quicker and easier alternative to vacuuming. ... The insecticide residual will both kill existing spiders and prevent new spiders from building their webs.

What spray kills brown recluse spiders?

Inspect and Clean: Inspect for brown recluse spiders and either vacuum them or spray them with a contact aerosol like Zenprox Aerosol or CB 80. Zenprox will quickly kill them and stay active for a period of time.

What keeps brown recluses away?

As mentioned, brown recluses don't like eucalyptus. They also tend to stay away from lemongrass, lavender, mint catnip, basil, lemon balm, and rosemary. Planting these near doorways and windows, as well as along points of egress, will also help keep spiders from entering your home, garage, shed, and crawlspaces.