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Finding mouse droppings without seeing any mice is a common sign of an infestation because mice are nocturnal and skilled at hiding from humans. Droppings are often the first and most visible evidence of their presence. The location, quantity, and freshness of the droppings can help you determine where the mice are most active and how severe the infestation might be. Since mice are active at night and often travel through hidden pathways like inside walls, you may not see them directly. It's important to look for other signs of an infestation, such as gnaw marks, scratching sounds, or greasy trails along walls. If you find droppings, consider setting traps or contacting a professional exterminator to address the issue.

While cockroaches can contaminate appliances and their contents, they won't cause damage. Cockroaches can spread bacteria like E. coli and salmonella, making it important to keep them out of places where food is stored, such as a refrigerator. When it comes to electronics, however, cockroaches could potentially damage internal electrical components. As the pests navigate inside a TV or console, they may touch high-voltage components that could short out your product. This damage could lead to costly repairs or require replacements.

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.

Common signs of a flea infestation include pets scratching or grooming excessively, visible fleas on pets, and red spots or bites on the skin of both pets and people. You may also notice dark spots on your pet’s fur, known as “flea dirt,” which is flea feces. Itching and irritation for both you and your pets are also strong indicators of an infestation.