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Badgers have a strong sense of smell, so it’s possible you can deter them with strong scents, such as applying citronella oil to the bottom of your fence, adding crushed scotch bonnet peppers sprinkled throughout your garden, or mixing both of these into a solution to spray around your home and garden.

Although it takes time and possibly multiple treatments, roaches can be eradicated from your home. However, they can return if the conditions are right. That’s why taking the steps to prevent an infestation is key. You may also want to discuss preventative pest control treatments with your exterminator. That way, you can reduce the risk of another infestation. 

To keep animals out, you must prevent them from entering. As long as they can get in, the problem will persist. That said, consider making your attic less inviting using deterrents like motion-activated lights or ultrasonic devices. Additionally, keeping a well-maintained, clean, and uncluttered attic that you regularly inspect for activity may make the space less attractive to critters.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.