I spray $3-4 worth of Ortho Home Defense Max outside the house every 3 months and it seems to be working. I draw a line where the foundation meets the ground and around doors and windows. I also spray the ground side of the top horizontal plank and the bottom of the fence.
My 6-year old likes to collect spiders. I sprayed the container once with Ortho and newly caught spiders would die quickly even weeks later. She thought all the spiders in the neighborhood are very sick.
