However, you still need to carefully select the product most suited to your pest problem. For example, some insecticide products are designed to kill flying insects. They are quick-acting and deposit no toxic residue, so they will kill only those pests contacted with the insecticide. Since silverfish and firebrats hide during the day, applying a nonresidual spray would kill only those pests contacted by the insecticide. For this reason, product selection is important.
Aerosols also are available.
Follow label directions exactly, and always check the active ingredients listed on the label to make sure the spray contains one of the aforementioned chemicals and can be used indoors. Thoroughly spray surfaces that silverfish or firebrats crawl over. Spray around baseboards, door and window casings, closets, and places where pipes go through walls or floors. Before spraying around upholstered furniture, draperies, carpeting, or wall coverings, test an inconspicuous spot to make sure the chemical will not stain the fabric. If you are doubtful about treating some surfaces, consider calling a professional pest control operator who will assume the risk and liability of the treatment.