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There could be some reasons why carpet beetles keep coming back, including a lack of sanitation, an infestation of another pest species that the beetles are feeding on, or a failure to treat the entire area.
Primarily however, usually traps are for mitigating the issue and identifying it in the first place. I’m using Diatomaceous powder, along with Deltamethrin insecticide,an IGR, Delta powder, double-sided sticky tape with Tanglefoot,etc. The spray can be used both inside and outside and is developed so that the active ingredient is not affected by the elements.
Cotton is not a preferred food source for carpet beetles unless it is heavily soiled with sweat or food stains. Since carpet beetles live in the shadows opening your closet up to natural light for a few hours each day can dissuade them from setting up a colony in your wardrobe.
They do not bite people but they do end up causing itchy, bumpy rashes that most people often mistake as bites from a bed bug.Insecticides can be formulated as dusts like the Delta Insecticide or come in the liquid form like the ready-to-use Ortho Home Defense MAX or the Demand CS concentrate. While Silverfish will happily munch on open containers of flour or pasta, they are best known for making meals out of books and loose pieces of paper.