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I'm not attempting to be negative here...but if you have to spray every month, the spray isn't working. In fact, spray generally is quite ineffective against things like spiders, scorpions, etc. What it does kill is other insects like caterpillars, roly polys(which are not insects, but crustaceans), butterflies, flies, beetles, crickets, etc. Spiders and scorpions do not eat anything with poison on it because they eat other bugs. The only way most sprays can be effective against arachnids is if the spider/scorp/whatever happens to eat a spray coated bug BEFORE it dies from the poison. Then, the spider will die, too. Otherwise, bug sprays are essentially ineffective against the "creepy" creatures most people hope to get rid of.
You are going to have more luck getting rid of spiders and scorpions if you create an environment that isn't so friendly to the bugs that they eat. If there are no food bugs, the spiders have no desire to hang around and will start living elsewhere.
I spend waaay too much time keeping/studying/researching Arthropods, so I'm always interested in "bug" related conversations. lol
Ditto on the spray thing. My daughter is in an entomology class (she loves creepy crawlies! YUCK! She is studying to be a scientific illustrator) she states that a spider does not clean and preen itself the way a roach or most other bugs do, so they do not ingest the poison. The only way to get rid of a spider is either get rid of its webs or smoosh it. I vote for the smoosh thing, she votes for putting it in a jar and bringing it in the house (this is why she doesnt live with dear old mom!)
