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Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

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.

Leaving lights on is not an effective or foolproof method for keeping cockroaches away. While roaches are nocturnal and prefer darkness, light alone is not enough to stop them, especially if they are seeking food, water, or shelter. A bright light might temporarily discourage them, but hungry or determined roaches will often adapt and venture into lit areas. For more effective cockroach control, it is better to focus on proven prevention methods. These include maintaining cleanliness by eliminating food crumbs, sealing cracks and entry points, reducing clutter that provides hiding spots, and fixing any moisture issues. Using traps or repellents can also be part of a comprehensive strategy.

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.