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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.

Cleaning your home after discovering fleas is an all-day job, but this may not be the last you see of them. Some fleas are resistant to initial treatments and may lay eggs that will hatch after your first pass. Continue with treatments for one to two months to fully eradicate them.

Most spiders are harmless or do little more than the equivalent of a bee sting. Prevention is the best option for more serious cases. Keep spiders out of your home when possible. When you find spiders, a spider nest, or egg sac, remove it quickly before an inquisitive pet or child gets involved. When children are old enough, teach them to recognize the few dangerous species of spiders and avoid them to prevent getting bitten.

The best termite treatment depends on your specific infestation, home, and budget. According to the Environmental Protection Agency (EPA), the most common professional treatments are soil-applied barrier treatments, like liquid termiticides, and termite baits. Bait stations are placed in the soil and work by moving poison back into the colony to kill the queen. For infestations that haven't fully taken root, barriers and targeted termiticides are often the most effective options. Additionally, preventative measures such as moisture removal and installing physical barriers to protect vulnerable wood are important, particularly during construction or remodeling. It is best to work with a termite professional to determine the right treatment for your situation.