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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.

If the nest is on or in your home, you should have an exterminator remove it. However, if the wasp nest is in an area of your yard that you don't frequent, you can leave it alone as long as the wasps don’t bother your household members. Wasps are very active during the summer months, but they will vacate in the fall and not return until the following year. So, if it's safe to do so, you can leave it, but if it poses a threat of being stung because it's in an area that you use frequently, consider having it removed.

Ticks aren't dangerous, but their bites are often imperceptible thanks to a numbing agent in their saliva. They can carry and transmit pathogens to people and animals, leading to diseases such as anaplasmosis, babesiosis, and Lyme disease. So if you live in a region with a high tick prevalence, tick treatment is worthwhile to keep your family and pets safe.

Ticks love conditions where humidity is 90% or higher, so most ticks will die within a few hours to a few days in the average climate-controlled house.