Relevance. Should this finally kill this little devil spider. It has been suggested that spraying plants with a 1:1 mixture of alcohol and water will kill spider mites on contact. I'm just wondering, will rubbing alcohol kill spiders? (Image: Close-up of a Brown Recluse via Shutterstock) Related Topics: Zoology. Does Windex Kill spiders? Let either the dish soap or rubbing alcohol sit on the plants a few hours, and then rinse the leaves thoroughly with water. More from Smithsonian.com: I removed the jar after a good minute and he was still alive escaped but I caught him again. There a BIG SPIDER outside my room and I can't go to the bathroom since I have a Arachnophobia. 7. Definitely, it does. Answer Save. Rubbing alcohol , like any alcohol for any creature, is poisonous in high dosages, and it evaporates quickly doing little damage to the plant it's been sprayed on. The now dead spider and alcohol can then be poured into the toilet and flushed away. Yes, it kills the spider because salt is naturally toxic to spiders. Arthropods have nervous systems made of neurons, much like we humans have. Any substance that may be harmful to humans may have a similar effect on spiders and insects in general. The now dead spider and alcohol can then be poured into the toilet and flushed away. So if you have to kill the spider, do it kindly and gently—in the freezer. The type of alcohol is very important: you need to preserve the spider without drying it out to make sure it becomes a good part of your bug collection. Mixing with water results in a solution, which you can use to spray at the webs to directly kill the insects or destroy their nests. Alright I caught a spider under a jar poured rubbing alcohol from the top thinking this would surely kill him. The outer surface, or cuticle, of these creatures is coated with a water-repelling lipid or wax layer that protects them from dehydration while keeping out unwanted material. 6 years ago. The cold will kill the spider without causing it to shrivel or distort. This means the ones you fail to kill will spread to other locations throughout the house to get away from the smell, resulting in an even worse bed bug infestation. Rubbing alcohol: The rubbing alcohol you have around the house also can kill spider mites. Does Rubbing Alcohol Repel Bed Bugs? He is now in my jar soaking in rubbing alcohol in a concealed container. Does rubbing alcohol kill or repel spider? I don't what to do and I only have Rubbing Alcohol and Powder here in my room. Add several inches of alcohol to the vial. 6. Another major risk is the fact that the smell of these alcohols repel bed bugs. Does saltwater kill spiders? Isopropyl alcohol works on contact against aphids, spider mites, mealybugs and scale insects. The next day, pour enough rubbing alcohol in the container to submerge the frozen spider to insure that it will not recover from being frozen. I'm pretty bug phobic. 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