How can i get rid of spiders? ?

Killing them does nothing. Killing them ALL is what you need. They say many insect/arachnid proofing poisons that you spray around the outside perimeter of your house where it meets the ground and I've done that before and it worked very well. You can follow this up with non-residue leaving products that you place around the inside of your house and then set them off and they spray the interior of the house continuously for a while and you have to leave your house for 4-6 hours but it will kill the ones inside. The aforementioned bug barrier product will prevent new ones from entering, so you should be spider free.