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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.

Yes, it’s actually common to see more cockroaches after you spray. It might seem like things are getting worse, but that’s usually a sign the treatment is working. Roach sprays and baits can flush them out of their hiding spots as they try to escape the chemicals. You might notice them acting strangely—slower, twitching, or out during the day when they’re usually hiding.

Most people can get rid of drain flies within a week as long as they remain persistent. This is especially important if you’re using a gentler method like vinegar or boiling water. Any eggs left behind can hatch, and the problem can start all over again. If you can’t get rid of the flies within a week or two, consider hiring a pro.

The best hornet repellent includes a variety of essential oils such as peppermint, clove, geranium, and lemongrass, all of which have a pungent smell that hornets can’t stand.