There are several sprays that can kill spiders instantly. Here are some options:
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TERRO Spider Killer Spray: This spray is designed to kill spiders, including black widow, brown recluse, and hobo spiders, as well as other insects like ants, roaches, scorpions, ticks, and silverfish. It can be used indoors and outdoors.
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DIY vinegar spray: Mix one part vinegar and two parts water in a spray bottle. Spray this on all possible entry points for spiders, including windows and doors. Spray this every week.
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DIY essential oil spray: In an empty 16 oz glass spray bottle, pour 7 drops of peppermint essential oil. Then add warm water until about an inch from the top. Add a few drops of dishwashing liquid then shake thoroughly. Spray this on areas where you have seen spiders before. Spray it also on possible entry points of the spiders.
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Stryker 54 Contact Spray: This pyrethrin aerosol spray is used for killing spiders on contact and flushing them out of hiding places. It can be used indoors and outdoors.
When using any spray, its important to follow the instructions on the label carefully and take appropriate safety precautions.