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I hate to be a negative-Bertha; but this is just not true! Spiders are not like cockroaches where you spray for prevention and to kill - it will kill a spider and it's eggs if you sprayed directly on them, but to spray for prevention... freshly sprayed surface may cause a spider to go the other way, but as soon as its dried it will have a zero effect...
The reason I know this, aside from googling my life away after consistently finding these giant wolf spiders in my family room plus a brown widow behind a painting frame, is that I spoke to three different exterminators and got: "oops,sorry - doesn't work that way with spiders, but don't worry; wolf spiders or widows are not aggressive, so you're fine!".
Again, sorry for the counter-comment, but I don't want anyone get too comfortable for spraying and then end up shocked and screaming (like my husband: "Honeeeeey; SPIDER!!! Come take it out!!!" Yeah, I don't really kill them, just pick them by the back leg and flick them out... but would prefer them not to come in at all!)!!