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When you spray a roach, the chemicals, usually a mix of neurotoxins like pyrethroids or pyrethrins, start affecting its nervous system almost immediately. It disrupts the roach’s nerve signals, causing paralysis and eventually death. You'll often see the roach twitch, flip over on its back, and stop moving within seconds to minutes.

These are the signs of bed bugs to look out for:

• Blood or rust-colored stains on mattresses, fabrics, or upholstery

• Dark spots of excrement that look like dots from a fine-tipped permanent marker

• Tiny eggshells and yellowish shed skins

It can be difficult to know what type of animal is in your attic until you see it. But several clues can help you narrow down the suspects:

• Sounds: Smaller animals like rats and mice make scurrying and tapping/gnawing sounds. Larger animals like raccoons and opossums make louder clambering noises. Also, note when animals are noisy: Squirrels are active during the day, while rats are busiest at night.

• Droppings: Rats and mice leave small, rice-shaped droppings (the rat’s version is significantly larger). Bigger droppings belong to larger critters like raccoons. As long as you’re not squeamish, an image search can help you identify what you’re seeing in your attic.

When in doubt, take photos of damage or other evidence and show them to an experienced pest control pro.

Scented mouse deterrents, like peppermint oil, can be effective in the short term. The pungent smells may temporarily repel mice, but they lose effectiveness as the scent fades or mice get used to it. The main drawbacks are frequent reapplication and the fact that these deterrents don't address the root cause of the infestation, such as entry points or food sources. While they can be part of a broader strategy, scented deterrents alone are rarely enough to eliminate a mouse problem.