This product is very effective and I could see his same action on spiders. I recommend this product because it kills fleas and ticks in the baskets of animals (of course with a complete pest control in animals) but also eliminates bed bugs, spiders, cockroaches and ants in a few minutes. It does not stain fabrics, I put in the baskets of my dog on my carpet, my mattress and even my curtains and I did not have any tasks. By cons must ventilate the room after use.