Results will vary according to the type of pest concern you are having. Upon arrival, your Imperial Pest Prevention technician will talk with you about the insect concerns you are having. After determining the severity of infestations, your property will be treated accordingly. Some pest removal services such as wasp nest spray will notice immediate results. Severe German cockroach infestations can take as long as long as a few months for full eradication. Your pest control technician will outline your insect concerns and expectations.