Spiders/Insects, some are afraid of them, some just cannot get rid of them from their homes. However, there is an easy solution, the smell of peppermint.
Here is a cheap recipe. Mix peppermint oil with water and put the mix in a spray bottle. Spray it everywhere in the house, especially in places where usually insects reside in your home such as windows, doors, and every possible corner in the house. This spray will help you to eliminate spiders and other insects, and also stop them to come to your house.
This plant is very effective against mice. So, it will not eliminate only spiders and other insects, but also mice. Therefore, memorize this recipe and use it against this vermin.