Cypermethrin is available via internet shopping and kills spiders and scorpions on contact. I use a wetable power form and spray indoors and out. Indoors you spray along baseboards, under sinks and places the critters can hide. Outdoors I spray at the base of the outside walls. Cypermethrin is a cousin to Permethrin and both are kid and pet safe after the application dries. This will also kill ants, roaches, silverfish, and on and on and on.

We had a bad spider and scorpion problem in our house and now only find dead ones or sick and dying ones.

Scorpions eat spiders but I wouldn't raise scorpions to control spiders. If you find big fat spiders it is a sure thing they are getting plenty to eat. Spray with Cypermethrin and you will eliminate all the little bugs the spiders feed on and SHAZAM, no spiders.

Pat