I normally do no use chemicals outdoors but indoors my wife does not like bugs so I sprayed for bugs in the past. I have not done so in the last two years but we find dead bugs that come in from under the house. As soon as they reach the points that I sprayed two or more years ago they go flip and die. Now our spiders do not die as they are up on the walls. I thought they were wolf spiders but no they are jumping spiders that inhabit our home on occasion. Anyway the bug killer is still active even though I have washed the floors several hundred times in the last few years; potent stuff.