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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.

You may find fleas in your bed if they followed you there on your pet or your clothing. While they will need you or an animal as a host, they can hide in bedding since it is warm and out of sight. If you spot signs of fleas or see live fleas in your bed, hire a flea control specialist immediately to eradicate the infestation and prevent it from spreading further.

Always begin by removing the gnat's source of food. Toss rotting fruit, place new fruit in the fridge, and switch the soil of your houseplants. 

The best way to get rid of gnats in the kitchen is by baiting and trapping them with something sweet. Combine water with a few drops of dish soap, apple cider vinegar, and 1 tablespoon of sugar into a bowl. Cover with plastic wrap and poke small holes to trap the gnat in the liquid.

Yes, pest-repellent plants can be used along with other deterrents such as deer-resistant fencing. In fact, using multiple deterrents will usually get you better results.