Chemical Warfare with Dangerous 8-legged Beasts in the Garage

I realize that I can't get rid of them all and that more will eventually come, I know that I live in the country, I know that some spiders to play useful roles in the delicate balance of life... but I feel better knowing that the nest of Brown Recluses I found is no longer a threat. I counted 5 full grown adults, 2 younger ones and 4 egg sacs. Gone. No more. I hope that means I have successfully avoided an infestation, but time will tell.