Squirrel Repellents - Are not effective in getting squirrels out of an attic. Ammonia, coyote urine, pepper sprays, mothballs, and ultrasonic animal repellents don't deter squirrels. There are numerous squirrel repellent products for sale at hardware stores and on the internet that guarantee to solve your rodent control issue. The truth is, none of these squirrel repellents work. If there is a squirrel in your attic, it is almost always a female squirrel with pups. What can be guaranteed, is that there is no wildlife repellent that is going to get that female squirrel to abandon her offspring and leave the attic of your Long Island home.