Every day or two the corners outside where my garage door goes up and down has a large three foot by three foot spider web. If I don't knock them down, they just get larger and larger until they connect from one spider web to the next making stepping outside from the garages almost impossible. We have tried sprays to kill the spiders and have continually knocked them down, but they keep coming back. Someone suggested after we knock them down to spray some PAM kitchen spray as it will cause the surface to be to slick for the spider webs to attach, but have not tried that. Any thought on what to use to keep the webs from keep coming back?