Even if you don’t see rodents, you might know they are in the attic because of what they leave behind. Before cleaning up this mess, you will want to completely clear the infestation and seal off the space.
Mice and rats are proficient chewers, and they tend to go after insulation, electrical wires, and wood. You might also note damage on your home’s exterior where larger rodents have chewed their way in.
If your attic is simply a storage space where you don’t spend much time, you might identify rodents by the noises they make. Scratching, scraping, and thumping noises in the attic are likely sound effects of a rodent infestation.