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 ya. Typical house spider egg sac has anywhere from four hundred to eight hundred baby eggs in it because these little white markings eventually within a year those egg sacs will hatch and even though the garages been sprayed it'll reinfest. If this was in your wall or up around the siding on the exterior of your house around your windows sill those baby eggs would be all over inside your home.
Anytime you live next to an open field, a golf course or a lake you get a lot of little spiders ballooning over to your house they spin a little web in the wind when their babies and the wind picks up that web and carries it to the high tree or to your house where they'll attach to your house and start to thrive. Eventually they grow up in a way and this is what we have here we have five egg sacs each containing about two hundred ends so while the problem did not originate here they got here and now they're laying eggs directly on your wall, problem is that these egg sacs, hatch they're gonna find a way in this window from small cracks or crevices and pressure inside your home.