Just to emphasize what gamayun said, spiders eat other bugs. If you have spiders, it is because you have other bugs. Focus on getting rid of the other bugs, by getting rid of their food source, and the spiders will leave on their own.
Too many people have a "thing" about spiders, and so they focus on trying to get rid of the spiders first. Complete waste of time. As long as the other bugs are there, the spiders are going to come back. And soon.
Besides that, there are 3,000 different species of spiders in North America. Exactly two of them represent any
danger to humans. Those being the black widow and the brown recluse. Every other species of spider in North America can do you no more harm than an ant bite would.
Good luck getting rid of your bugs.