Garages are notorious places for cobwebs and spiders. This area has been treated, but there are quite a few egg sacs. Let me see if I can pull a few out for you. A typical house spider egg sac has anywhere from four hundred to eight hundred baby eggs in it. You can see these little white markings eventually within a year those egg sacs will hatch and even though the garage has been sprayed, it'll re-infest. If this was in your wall or up under the siding on the exterior of your house around your windowsill, those baby eggs would be all over inside your home.