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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.

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.

Bleach, which can kill drain flies, can also kill fruit flies, but it’s better to lure fruit flies to a liquid rather than applying chemicals, as it’s very difficult to reach them all. A more practical approach is to lure fruit flies with traps made from liquids like apple cider vinegar mixed with dish soap. This method is safer and more efficient, since it targets a larger number of fruit flies without relying on harsh chemicals that may not reach all the pests.

Yes, many services include cleanup and sanitization to remove droppings and odors. Confirm with your provider.