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As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.

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.

The full process of using a rat exterminator can take several weeks. If you have a larger infestation, the exterminator may need to return several times to collect rats. The timeline of your rat eradication depends on the infestation size and type of treatment, so consult a rat exterminator to get an accurate estimate for your specific issue.

Whether dryer sheets can keep squirrels away is a bit of a mystery because the evidence is entirely anecdotal. Many households claim to have success with using dryer sheets for keeping squirrels away by placing them throughout their attics, yards, on a clothesline, and any other area where squirrels like to run through. Squirrels do not like strong scents, so if you try using dryer sheets, the ones with the strongest scent may be the most effective.